Question

The mean of 10 numbers is 28. If one number is excluded, their mean is 25. Find the excluded number.​

Answer 1

Answer:

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Step-by-step explanation:

so here the mean of ten numbers is 10

thus then sum of all numbers=28×10=280

so then let the excluded number be x

so thus then after excluding x

mean of nine numbers=25

thus sum of nine numbers=25×9

=225

hence x=280-225

=55

Answer 2

Answer:

55

Step-by-step explanation:

mean1=

sum / 10=28

sum =28×10

=280

again, 1 number excluded, then mean2 becomes 25.

let the number be x

A/Q,

(sum - x)/9=25 ( 9 because out of 10 1 is excluded.)

280-x=25×9

280-x=225

therefore,

x=280-225

x=55