https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/mean-and-median/v/statistics-intro-mean-median-and-mode 2021-07-02T09:35:33Z Statistics intro: Mean, median, & mode The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to greatest. The mode is the number that occurs most often in a data set. Sal Khan video https://cdn.kastatic.org/googleusercontent/CCE1P6AZCPMYb0O7ETz8QOfZprfRYDEJ6SzhUngxHNsFrM6XOvqMRjghbAf1r4TiUcKH7HiPbXA8jlxRUDeTW2_V Statistics intro: Mean, median, & mode The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to greatest. The mode is the number that occurs most often in a data set. https://cdn.kastatic.org/ka-youtube-converted/h8EYEJ32oQ8.mp4/h8EYEJ32oQ8.mp4 534 Measures of central tendency and variability https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/mean-and-median/v/mean-median-and-mode 2021-07-02T09:35:33Z Mean, median, & mode example Here we give you a set of numbers and then ask you to find the mean, median, and mode. It's your first opportunity to practice with us! Sal Khan video https://cdn.kastatic.org/googleusercontent/XO41bx61VCaBIqGEW5twdbSuuSR_FvZOslArqu3JarSQbHbBgquWeq_EsBGPvqRW4c9a0BPVLY-LxMIwZUaZSAEb Mean, median, & mode example Here we give you a set of numbers and then ask you to find the mean, median, and mode. It's your first opportunity to practice with us! https://cdn.kastatic.org/ka-youtube-converted/k3aKKasOmIw.mp4/k3aKKasOmIw.mp4 235 Measures of central tendency and variability https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/v/range-variance-and-standard-deviation-as-measures-of-dispersion 2022-11-16T04:22:43.7414897Z Measures of spread: range, variance & standard deviation Range, variance, and standard deviation all measure the spread or variability of a data set in different ways. The range is easy to calculate—it's the difference between the largest and smallest data points in a set. Standard deviation is the square root of the variance. Standard deviation is a measure of how spread out the data is from its mean. Sal Khan video https://cdn.kastatic.org/googleusercontent/F7u5R7KncKAiNkwZK0i3DTxYrCpwFG1YuVhgwHtYHWUsRNB9rlgxRnkqR4onfr1ex44Yc9FmnodarnP_ZcWwhCg Measures of spread: range, variance & standard deviation Range, variance, and standard deviation all measure the spread or variability of a data set in different ways. The range is easy to calculate—it's the difference between the largest and smallest data points in a set. Standard deviation is the square root of the variance. Standard deviation is a measure of how spread out the data is from its mean. https://cdn.kastatic.org/ka-youtube-converted/E4HAYd0QnRc.mp4/E4HAYd0QnRc.mp4 754 Measures of central tendency and variability https://www.khanacademy.org/math/ap-statistics/random-variables-ap/xfb5d8e68:mean-standard-deviation-random-variables/v/variance-and-standard-deviation-of-a-discrete-random-variable 2024-01-19T18:34:27.70568811Z Variance and standard deviation of a discrete random variable We learn how to calculate the mean and standard deviation of a discrete random variable. The concept of a random variable is explained, along with methods to calculate its expected value (mean) and measure its spread (variance and standard deviation). A practical example makes the concept easier to understand. video https://cdn.kastatic.org/ka_thumbnails_cache/1480a2e2-c783-4cc6-b18d-f26efd6e3e77_1280_720_base.png Variance and standard deviation of a discrete random variable We learn how to calculate the mean and standard deviation of a discrete random variable. The concept of a random variable is explained, along with methods to calculate its expected value (mean) and measure its spread (variance and standard deviation). A practical example makes the concept easier to understand. https://cdn.kastatic.org/ka-youtube-converted/2egl_5c8i-g.mp4/2egl_5c8i-g.mp4 386 Measures of central tendency and variability https://www.khanacademy.org/math/ap-statistics/summarizing-quantitative-data-ap/measuring-spread-quantitative/v/sample-standard-deviation-and-bias 2021-07-01T17:39:49Z Sample standard deviation and bias Sal shows an example of calculating standard deviation and bias. Sal Khan video https://cdn.kastatic.org/googleusercontent/vMLDdSrGOUFmBkMXPZpxFVEmxBqn0ImXjUYJO1L-LCCob1WZtBM65vnfgdWm0NWFwfDTmDQFUP7YHr9tvEDdsss Sample standard deviation and bias Sal shows an example of calculating standard deviation and bias. https://cdn.kastatic.org/ka-youtube-converted/DNAnQBhGpRw.mp4/DNAnQBhGpRw.mp4 573 Measures of central tendency and variability https://www.khanacademy.org/math/ap-statistics/summarizing-quantitative-data-ap/measuring-spread-quantitative/v/sample-variance 2024-01-19T18:34:27.70568811Z Sample variance We delve into measuring variability in quantitative data, focusing on calculating sample variance and population variance. The importance of using a sample size minus one (n-1) for a more accurate estimate is highlighted. The distinction between sample mean and population mean is also clarified. Sal Khan video https://cdn.kastatic.org/googleusercontent/ovbflWyVJWPSU5OpM1Gy72CSUBwfhLsja194Vc3LcFlz79-EvWHayP0Z68LkWdbiyaXgQ23eTj1qUtP1TgcIYafi Sample variance We delve into measuring variability in quantitative data, focusing on calculating sample variance and population variance. The importance of using a sample size minus one (n-1) for a more accurate estimate is highlighted. The distinction between sample mean and population mean is also clarified. https://cdn.kastatic.org/ka-youtube-converted/iHXdzfF7UEs.mp4/iHXdzfF7UEs.mp4 638 Measures of central tendency and variability https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/mean-and-median/a/calculating-the-mean 2023-02-22T02:28:53.374012061Z Calculating the mean Learn how to calculate the mean by walking through some basic examples & trying practice problems. article https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/a/introduction-to-standard-deviation 2023-02-22T03:54:13.328982673Z The idea of spread and standard deviation See how distributions that are more spread out have a greater standard deviation. article https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/a/concept-check-standard-deviation 2024-11-04T03:24:04.544183802Z Concept check: Standard deviation Six questions that will help you understand standard deviation more deeply. article https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/a/calculating-standard-deviation-step-by-step 2021-07-03T00:16:52Z Calculating standard deviation step by step article https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/mean-and-median/e/calculating-the-median 2026-04-08T00:54:09.631945657Z Calculating the median Practice finding the median of a data set. Like the mean, the median gives us a sense of the middle, or center, of the data. Ben S exercise https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:statistics/x06d55bfa213a79fd:measures-of-central-tendency/e/finding-median-of-the-data 2025-03-28T07:05:36.573142233Z Finding Median of the data This exercise is curated for new ncert and the problems involve finding mean from the given dataset Devashish Phadnis exercise https://www.khanacademy.org/math/strengthened-shs-general-math/x24dc5a0902f75de5:patterns-arithmetic-and-geometric-sequence-and-series/x24dc5a0902f75de5:measures-of-central-tendency-and-variability/e/median-of-grouped-data 2025-12-30T07:05:15.972746521Z Median of grouped data Let's try to practice finding median of grouped data. ashish exercise https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:statistics/x06d55bfa213a79fd:measures-of-central-tendency/e/statistics-15-b 2025-03-28T07:05:36.573142233Z Mode Statistics ashish exercise https://www.khanacademy.org/math/strengthened-shs-general-math/x24dc5a0902f75de5:patterns-arithmetic-and-geometric-sequence-and-series/x24dc5a0902f75de5:measures-of-central-tendency-and-variability/e/mode-of-grouped-data 2025-12-30T07:05:15.972746521Z Mode of grouped data Let's practice finding the mode of a grouped data. ashish exercise https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/e/mean_median_and_mode 2025-03-01T15:52:37.13987578Z Mean, median, and mode Calculate the mean, median, or mode of a data set! Omar Rizwan exercise https://www.khanacademy.org/districts-courses/grade-6-scps-pilot/x9de80188cb8d3de5:measures-of-data/x9de80188cb8d3de5:unit-8-topic-4/e/range-of-ungrouped-data 2026-04-08T00:54:09.631945657Z Range of ungrouped data Range of ungrouped data ashish exercise https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/e/standard_deviation_of_a_population 2025-03-01T15:52:37.13987578Z Standard deviation of a population Calculate the standard deviation of a population. exercise https://www.khanacademy.org/math/ap-statistics/summarizing-quantitative-data-ap/measuring-spread-quantitative/e/sample-standard-deviation 2021-07-01T17:39:45Z Sample standard deviation Practice calculating sample standard deviation Jeff Dodds exercise