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November 10th, 2011, 04:34 PM   #1
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statistics problem on normal distribution??

a management consultant found that the amount of times per day spent by executives performing tasks that could be done equally well by subordinates followed a normal distribution with a mean of 2.4 hours. it was also found that 10% of executives spent over 3.5 hours per day on tasks of this type. for a random sample of 400 executives find the probability that more than 8 spend more than 3 hours per day on tasks of this type.

the answer is supposed to be .975.
i found the standard deviation to be .86, but i'm thinking that's where i went wrong.... but i can't figure out where exactly i messed up. anything would help! thanks!
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