Question

please answer if anyone knows​

Answer 1

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Required Answer:-

Mean or Average is calculated by dividing the total sum of all items by the total number of items.

In this question, we have to add all the marks and divide it by total number of students.

Class - (1)

No. of students = 100

Mean marks = 30

Then, Total marks = 100 × 30 = 3000

Class - (2)

No. of students = 50

Mean marks = 60

Total marks = 50 × 60 = 3000

Find the mean marks of both classes:

= Total marks / Total no. of students

= 3000 + 3000 / 100 + 50

= 6000 / 150

= 40

∴ The mean marks of two classes taken together is 40 (Option A).

Note:-

Sometimes average is asked instead of mean. Both are synonymous to each other.

Always add the all total at the last for final answer.

Answer 2

Answer:

are sorry to hear from you

Step-by-step explanation:

sorry I don't know about this but I try my best