Homework Help: Advanced Math

Posted by Patrick on Tuesday, August 11, 2009 at 12:47pm.

A set of 750 values has a normal distribution with a mean of 12.5 and a standard deviation of 0.36.

A. What percent of the data is between 12.25 and 12.75?
ANSWER: 51.6%

B. Find the interval about the mean within wich 45% of the data lie.
ANSWER: 12.28-12.72

C. Find the probability of that a value selected at random from this data is between 11.67 and 13.33.
ANSWER: 97.9%

Are these correct?

Advanced Math - MathMate, Tuesday, August 11, 2009 at 5:27pm
Yes, they are correct.
I find minor differences in the last digits, probably due to round-off or interpolation errors.

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