The average of a class of 33 student is 13 year If one student leaves the class the average age become 12whole15/16 years what is the age of the student.
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Answer:
mean =
\frac{sum \: of \: observation}{number}
number
sumofobservation
13=
\frac{sum}{33}
33
sum
sum of age of 13 girls = 429
after leaving 1 girl
no of girls = 32
mean = 207/16
sum of age of 12 girls
\frac{207}{16} \times 32 = 414
16
207
×32=414
age of 13th girl =sum of 13 girls - sum of 12 girls
= 429 - 414
= 15 years
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