Suppose a set of test scores is appproximately bell-shaped, with a mean of 68 and a range of 60. (a) The minimum test score is approximately?And the maximum test score is approximately? (b) The...

Suppose a set of test scores is appproximately bell-shaped, with a mean of 68 and a range of 60.


(a) The minimum test score is approximately?And
the maximum test score is approximately?


(b) The standard deviation of the test scores is approximately  .