SOLUTION: 1. The distribution of Intelligence Quotient (I.Q.) scores measured for 100 students in a test is as follows: I.Q.* 40-50 50-60 60-70 70-80

Question 846924: 1. The distribution of Intelligence Quotient (I.Q.) scores measured for 100 students in a test is as follows:
I.Q.* 40-50 50-60 60-70 70-80 80-90 90-100
Number of Students 10 20 20 15 15 20
* The data is recorded with origin as 40, i.e. students with I.Q. between 80 and 90 are included in the first interval. The intervals included the upper class value but not the lower.

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