Question

A weather station recorded the temperatures of a place over a period of 7 days as follows:

Day	Temperature (in ${}^{\circ }$C )
Monday	45
Tuesday	38
Wednesday	40
Thursday	42
Friday	41
Saturday	37
Sunday	36

Find the probability of a day having a temperature of less than 40 ${}^{\circ }$ C.

• A. $\frac{2}{7}$
• B. $\frac{5}{7}$
• C. $\frac{4}{7}$
• D. $\frac{3}{7}$

Answer 1

The correct option is D $\frac{3}{7}$

Here, the total number of days = 7
Event, E = A day having a temperature of less than 40${}^{\circ }$C.
It can be seen there are only 3 days where the temperature is less than
40${}^{\circ }$C, namely, Tuesday, Saturday and Sunday.
Therefore, number of days where event happened = 3
We know,
$P\left(E\right)=\frac{\text{Number of trials in which the event happened}}{\text{Total number of trials}}=\frac{3}{7}$