Question

find mear
and median
15,15,10, 8.9.20.18​

Answer 1

Correct Answer:

Find the mean and median of 15, 15, 10, 8, 9, 20, 18​.

Given:

The order: 15, 15, 10, 8, 9, 20, 18​.

What To do:

We have to find the mean and median.

Solution:

• Finding the mean.

To find the mean we will use,

⇒ $\sf{\dfrac{Addition \: of \: all \: numbers}{Number \: of \: value \: in \: the \: order}}$

Substitute the values,

⇒ $\dfrac{15 + 15 + 10 + 8 + 9 + 20 + 18}{7}$

Add the numbers in the numerator,

⇒ $\dfrac{95}{7}$

Make it in mixed fraction,

⇒ $13\dfrac{4}{7}$

∴ So, mean is $\bold{13\dfrac{4}{7}}$.

• Finding the median.

To find the median,

Step 1: We will be first arrange in asscending or descending order.

Step 2: Then, find the middle number.

Arrange the order,

⇒ 8, 9, 10, 15, 15, 18, 20

Find the middle number,

⇒ 8, 9, 10, 15, 15, 18, 20  

∴ So, the median is 15.