Answer
The mean also increases by 4.
Work Step by Step
Explanatory method:
Original mean: $\frac{65+70+71+75+95}{5}=75.2$
New mean: $\frac{(65+4)+(70+4)+(71+4)+(75+4)+(95+4)}{5}=\frac{65+70+71+75+95}{5}+\frac{4+4+4+4+4}{5}=75.2+4=79.2$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 3 - Section 3.1 - Assess Your Understanding - Applying the Concepts - Page 140: 40e
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