45 students across the different levels of Intelligent Quotient are distributed in the grouped table given below.
IQ | 60-70 | 70-80 | 80-90 | 90-100 | 100-110 | 110-120 | 120-130 |
Students | 3 | 6 | 5 | 9 | 11 | 7 | 2 |
Class intervals (Ages) | Frequency (No. of patients) | Class marks | Points |
50-60 | 0 | 55 | (55,0) |
60-70 | 3 | 65 | (65,3) |
70-80 | 6 | 75 | (75,6) |
80-90 | 5 | 85 | (85,5) |
90-100 | 9 | 95 | (95,9) |
100-110 | 11 | 105 | (105,11) |
110-120 | 7 | 115 | (115,7) |
120-130 | 2 | 125 | (125,2) |
130-140 | 0 | 135 | (135,0) |