Discussion of Question with ID = 040 under Averages

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Question

The average number of visitors at a zoo on a Monday is 90, whereas it is 84 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

85.

B

86.

C

84.

D

83.

Soln.
Ans: a

The month begins on a Monday, so there will be 5 Mondays. The average = ${5 × 90 + 25 × 84}/30$, which equals ${450 + 2100}/30$ = 85.

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