The mean height of the students in a class is 152 cm. The mean height of boys is 15
with a standard deviation of 5 cm. And the mean height of girls is 148 cm with a stan
deviation of 4 cm. Find the percentage of boys in the class and also the S.D of heights
the students in the class.
[Ans. Percentage of boys = 40%, 012 6.6
The first of two subgroups has 100 items with mean 15 and standard deviation 3. If the
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