Effects of shifting, adding, & removing a data point

Mariah works at a zoo. She was looking at some data showing the masses of their $5$‍ African elephants. The mean mass of the elephants was $\mathrm{3,800}\text{kg}$‍, and the median mass was $\mathrm{3,600}\text{kg}$‍. The heaviest elephant, named Omar, was recorded as $\mathrm{6,000}\text{kg}$‍.

Mariah found out that Omar's mass was recorded incorrectly, and that Omar actually weighed $\mathrm{7,000}\text{kg}$‍.

How will Omar's mass increasing affect the mean and median?