Question

The mean marks of 5 students are 70 the marks of four students are 50, 60 ,70, 80 find the marks of 5th student

Answer 1

Hey

Here is your answer,

Step-by-step explanation:

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Given that,

Mean of marks of 5 students = 70

Let the marks scored by the fifth student be x.

Mean = sum of observations / total number of observations

70 = 50+60+70+80+x/5

When cross multiplying,

350 = 260+x

X = 350-260

X = 90

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Hope it helps you!

Answer 2

Hey friend here is your answer..........

let 5 th no. be x

by the formula of mean.....

70=50+60+70+80+x/5
70=260+x/5
70*5= 260+x
350-260=x
90=x

hope it's helpful.........
please mark as a brainliest..........