Question

Q2)Jim scores the following marks in 8 tests.
7,8,y,6,11,17,2
His mean mark is 7.5 .
Calculate the value of y.

Answer 1

Step-by-step explanation:

0000000000000000000000000

Answer 2

Answer:

The value of y is 9

Step-by-step explanation:

Given -

Jim scores the following marks in 8 tests.

The marks are $7,8,y,6,11,17,2$

Jim scores mean mark is $7.5$

To find -

The value of $y$

Solution -

The mean is the average of the numbers.

Average is a ration of addition of of marks to the number of test.

Mean marks = $\frac{Addition\:of \: marks}{number \:of\:test}$

Put the values in given formula

$7.5=\frac{7+8+y+6+11+17+2}{8}$

$7.5 \times 8 =7+8+y+6+11+17+2$

$60 = 7+8+y+6+11+17+2$

$60 = y+51$

$60-51=y$

$y=9$

∴ The value of y is 9 .