posted by Patrick .
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?
B. Find the interval about the mean within wich 45% of the data lie.
C. Find the probability of that a value selected at random from this data is between 11.67 and 13.33.
Are these correct?
Yes, they are correct.
I find minor differences in the last digits, probably due to round-off or interpolation errors.