Discussion of Question with ID = 033 under Averages

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Question

The average number of visitors at a zoo on a Monday is 96, whereas it is 156 on other days of the week. What will be the average number of visitors in a 30-day month that begins on a Monday?

A

146.

B

147.

C

145.

D

144.

Soln.
Ans: a

The month begins on a Monday, so there will be 5 Mondays. The average = ${5 × 96 + 25 × 156}/30$, which equals ${480 + 3900}/30$ = 146.

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