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)
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2
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
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Answer:
Step-by-step explanation:
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