Question

8.The Mean weight of a group of 20 persons was found to be

55 kg. Later it was discovered that one of them reported her

weight as 45 kg which was actually 54kg.Find the correct

mean of their weights.​

Answer 1

Answer is 55.45,hope this help

Answer 2

Answer:

The correct mean of their weight is 55.45

Explanation:

Given: The mean weight of a group of 20 person is 55 kg

Find: The correct mean of their weight.

Solution: The actual weight is 54 kg but misread weight is 45 kg.

So,

Difference in weight is $54-45=9kg$

Correct average weight is

$=55+\frac{9}{20} \\=55+0.45\\=55.45 kg.$

Hence, the correct mean weight is 55.45 kg.

#SPJ3