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3-21.

Dominic estimated the length of the tails of cats in his neighborhood, and his results are shown below.

Bounce: $10$ inches

Trounce: $11$ inches

KaBoing: $5$ inches

Stubby: $1$ inch

Stella: $12$ inches

George: $15$ inches

1. Find the mean, median, mode, and range of Dominic's data.

Try making a stem-and-leaf plot.

The mean is $9$ inches.
Remember to find the median and mode.

2. Dominic then measured the cats' tails and found that he had underestimated each cat's tail length by one inch. Predict what will happen to each of the measures of central tendency when each cat's tail length is increased by one inch. Then check your predictions.

The mean and one other value should increase.
Which one?
Don't forget to check.