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Small-cap mutual funds gained

Small-cap mutual funds gained an average of 8.4% in the first half of 2000. Assume that the distribution of returns in the first half of 2000 for mutual funds specializing in small companies is distributed as a normal random variable with a mean of 8.4% and a standard deviation of 10%. The return for 90% of small company mutual funds was less than what value?

Please show work. Thanks.

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Mean = 8.4%

Std Dev = 10%

Z value =(x - mean) / std dev

The question asks for the ...