If a data value in a normal distribution has a negative z-score, which of the following must be true?
the data value must be negative.
the data value must be positive
the data value must be less than the mean.
the data value must be greater than the mean.

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.

What is the product? a-3/15a × 5/a-3

Cone a has a surface area of 384 ft2 and cone b has a surface area of 96 ft? . what is the ratio of their volume?