Question

31. The mean of 10 number is 55. If one number is excluded their mean becomes 50, the
excluded number is :
a) 60 b) 70
c) 80
d) 100
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Answer 1

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Step-by-step explanation:

31. The mean of 10 number is 55. If one number is excluded their mean becomes 50, the

excluded number is :

a) 60 b) 70

c) 80

d) 100

Answer 2

Step-by-step explanation:

9n +x/10= 55

9n+x = 550.....A

also

9n/9= 50

9n= 450.....B

from A and B

x= 550-450= 100

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