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The numbers of students in the 

10

 schools in a district are given below. 

(Note that these are already ordered from least to greatest.)

178, 231, 240, 277, 303, 309, 366, 384, 432, 440

Suppose that the number 

178

 from this list changes to 

268

. Answer the following.

(a)   What happens to the mean?It decreases by

.

It increases by

.

It stays the same.(b)   What happens to the median?It decreases by

.

It increases by

.

It stays the same.