Question

Estimate the mean of the first four prime numbers to the nearest whole number.

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is D 4

The first four prime numbers are:
$2,3,5$, and $7$.

$Mean=\frac{Sumoftheobservations}{Numberofobservations}$

Here,

Number of observations = 4.

Inserting the values, we get:

$Mean=\frac{2+3+5+7}{4}$

$=\frac{17}{4}$

Converting the mean into its decimal form, we get:

$\frac{17}{4}=\frac{17\times 5}{4\times 5}=\frac{85}{20}=\frac{85\times 5}{20\times 5}=\frac{425}{100}$

$=4.25$

Rounding off the mean to the nearest whole number, 4.25 becomes 4.

∴ Mean of first 4 prime numbers estimated to the nearest whole number = 4