Question

The mean marks of a group of students is 60. If there marks are 85,62,36,48,72,x,72,39 find the value of x​

Answer 1

Given: Mean of given marks is 60.

To find: The value of x.

Answer:

Mean = Sum of all observations/Total number of observations.

Mean = 60

Observations: 85, 62, 62, 36, 48, 72, x, 75, 39

Sum of observations = 85 + 62 + 62 + 36 + 48 + 72 + x + 75 + 39 = 479 + x

Total number of observations = 9

Substituting the given values,

60 = 479 + x/9

60*9 = 479 + x

540 = 479 + x

x = 540 - 479

x = 61

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Answer 2

Step-by-step explanation:

Mean = sum of all observation/Total number of observations.

sum of observation=85+62+36+48+72+x+72+39=414+x

Total number of observation= 8

60=414+x/8

414+x/8=60

414+x=60×8

414+x=480

x=480-414

×=66

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