Question

please answer this question​

Answer 1

7 (Option B)

hope it helps you

Answer 2

Answer:

$\mathtt\pink{FORMULA \: USED:-}$

$\mathtt{MEAN = \frac{SUM. OF \: All \: OBSERVATIONS}{TOTAL \: NO. OF \: OBSERVATIONS} }$

$\mathtt\pink{SOLUTION:-}$

$\mathtt{MEAN = \frac{SUM. OF \: All \: OBSERVATIONS}{TOTAL \: NO. OF \: OBSERVATIONS} }$

$\mathtt{MEAN = \frac{3 + 4 + 5 + x}{4} = 5}$

$\mathtt{ \frac{12 + x}{4} = 5}$

$\mathtt{12 + x = 5 \times 4}$

$\mathtt{12 + x = 20}$

$\mathtt{x = 20 - 8}$

$\mathtt{x = 8}$

$\fbox\pink{Answer is 8}$