Question

Jana collects the quarters from a fountain every day for ten days. The table shows the number of quarters she collected each day.
Quarters from the Fountain
Day Number of Quarters
1 8
2 14
3 17
4 2
5 20
6 18
7 15
8 10
9 27
10 12

If she collected 30 quarters on Day 11 what would happen to the mean?

A The mean would lower.
B The mean would be higher.
C The mean would stay the same.
D There is not enough information to determine what would happen to the mean.
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Answer 1

B. The current mean is 143 ÷ 10 = 14.3. Adding 30 gives a new mean 173 ÷ 11 ≈ 15.73, which is higher. (Adding a value larger than the mean increases the mean.)