Question

The average of four numbers is 15.
The average of three of them is 10.
The fourth number is?
Question from basic statistics
Mathematics class 10 ​

Answer 1

I don't know

3x2-6= 4

this is the answer

hope it's correct

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Answer 2

Answer : 30 ✔️

There is given the Average of 4 no. = 15

As we know that :

Average = Sum of Numbers / Total numbers

=> Sum of 4 no. = Average × Total numbers

=> Sum of 4 no. = 15 × 4 = 60

Same

Also given that The average of 3 of them = 10

=> sum of 3 no. = 10 × 3 = 30

Fourth number = 60 - 30 = 30

So, the answer will be 30

I hope it will be helpful for you ☺️

Fóllòw MË ❤️