Professors at a local university earn an average salary of $80,000 with a standard deviation of $6,000. the salary distribution cannot be regarded as bell-shaped. what can be said about the percentage of salaries that are less than $68,000 or more than $92,000?

a. it is at least 75 percent.
b. it is at least 55 percent.
c. it is at least 25 percent.
d. it is at most 25 percent.

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so,about which interval is it approximately symmetric?