Question

The mean of 10 numbers is 55 if one number is excluded their mean becomes 50 find the excluded number

Answer 1

Answer:

Step-by-step explanation:

Mean 10 No.s =55

Sum=55*10=550

When 1 No.s is excluded mean becomes 50

Sum 9 No.s=50*9=450

So the reqd. No. is 100

Answer 2

Answer:

100

Step-by-step explanation:

mean = sum/no of observations

55 = sum/10

55 * 10 = sum

550 = sum --------------(1)

after excluding one number, we get:

50 = sum/9

50 * 9 = sum

480 = sum ---------------(2)

therefore, excluded number = 550 - 480

                                               = 100