Question

Q1. The mean score of a group of 20 students is 65. Two other students whose scores are 89
and 85 were added to the group. What is the new mean of the group of students?

Answer 1

Answer:

67.

Step-by-step explanation:

We know,

       Mean = ( sum of observations ) / ( number of observation )

In the first case : number of observations is 20 and mean is 65.

⇒ 65 = ( sum of score ) / 20

⇒ 65 x 20 = sum of score

⇒ 1300 = total score       ...( 1 )

When two students whose scores are 89 and 85 are added : number of observations = 20 + 2 = 22   &    sum of observations = 1300 + 89 + 85 = 1474

⇒ new mean = 1474 / 22

⇒  new mean = 67

Hence the new mean is 67 .

Answer 2

Step-by-step explanation:

Aloha !

$\text{ This is Twilight Astro ^_^}$

The mean of 20 students is 65.

If two students are then mean Will be.....?

65×20= total mean

1300.

If two students are added.

Then,

=1300+85+89/22

=1474/22

=67

Required mean is 67

Thank you

@ Twilight Astro ✌️☺️♥️