Question

A library has an average of 450 visitors on Sundays and 300 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
325
320
315
330​

Answer 1

Answer:

325.

Step-by-step explanation:

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Answer 2

The number of visitors per day are 320.

Given - Average visitors on Sundays and other days

Find - Average visitors per day

Solution - The average is calculated by the formula -

Average = sum of observations/total number of observations

Sum of observations = Number of visitors in total

As we know, a month with 30 days has 4 Sundays. Hence, there will 26 other days. Performing calculation as per this concept.

Sum of observations = 450×4 + 300×26

Sum of observations = 1800 + 7800

Sum of observations = 9600

Now, total number of observations is total number of days. Hence, total number of observations = 30

Average = $\frac{9600}{30}$

Average = 320

Hence, the average number of visitors per day in a month is 320.

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