Question

The table below shows the number of guests visiting a hotel in three days of a week.

Day	Number of guests
Friday	17
Saturday	21
Sunday	25

The mean number of guests visiting the hotel in three days is

• A. 18
• B. 20
• C. 21
• D. 23

Answer 1

The correct option is C 21

Mean is an average of the given numbers.
i.e, $\text{Mean =}\frac{\text{Sum of all the observations}}{\text{Total number of observations}}$

Day	Number of guests
Friday	17
Saturday	21
Sunday	25

Sum of all observations = 17 + 21 + 25
= 63
Total number of observations = 3
$\text{Mean =}\frac{63}{3}=21$

$\therefore$ The mean number of guests visiting the hotel in 3 days are 21.