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Statistics and probability

Course: Statistics and probability > Unit 1

Lesson 2: Two-way tables
Math
Statistics and probability
Analyzing categorical data
Two-way tables
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Trends in categorical data

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Problem

John and Lauren are looking for a good neighborhood to raise their children. They want neighbors who have kids and who are fellow rollerbladers as well. The couple surveys a random sample of residents in a nice-looking neighborhood. Their results are shown below.
David, Anastasia, and Miles live in the neighborhood. David is focusing on his career and does not have children. Anastasia has never rollerbladed. All we know about Miles is that he is very tall.
Calculate the following probabilities based on the frequency table below.
Round to the nearest hundredth of a percent.
Probability that David is a rollerblader =
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
%
Probability that Anastasia does not have kids =
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
%
Probability that Miles is a rollerblader =
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
%
KidsNo kidsRow total
Rollerblader41950
Not a rollerblader3912
Column total441862
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