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August 21, 2014

Homework Help: statistics

Posted by mary- please show correct calculations on Sunday, October 17, 2010 at 3:59pm.

for a particular sample of 77 scores on a psychology exam, the following results were obtained:
first quartile=44, third quartile= 71, standard deviation=6, range=45, mean=64,median=57, mode=32, midrange=60

a)according to chevyshev's theorem how many students scored between 48 and 88?

b) assume that the distribution is normal. based on the empirical rule, how many students scored between 46 and 82?

* i came up with 12 for a and 24 for b, is that correct?
please help and show where i went wrong. thank you

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