Question

3. The mean height of the students in a class is 152 cm. The mean height of boys is 158
with a standard deviation of 5 cm. And the mean height of girls is 148 cm with a standard
deviation of 4 cm. Find the percentage of boys in the class and also the S.D of heights of al
the students in the class.
[Ans. Percentage of boys = 40%,mean 12 =6.603)​

Answer 1

Answer:

Total height of 15 students =∑x=154×15=2310cm

It was found that 175cm was wrongly read as 145

Correct sum =2310−145+175=2340cm

Correct mean =

15

2340

=156cm

Answer 2

Answer:

Step-by-step explanation:

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