the full table gives the marks obtained by 80 students in a selection test
marks BELOW 10 Below 20 Below 30 below 40 Below 50 Below 60
no. of students 3 12 27 57 75 80
no.of students
Answers
Mean = 33.25 , Median = 34.33 Mode = 35.55
Step-by-step explanation:
Class cf f Mean Class f*mean Class
0-10 3 3 5 15
10-20 12 9 15 135
20-30 27 15 25 375
30-40 57 30 35 1050
40-50 75 18 45 810
50-60 80 5 55 275
Total 80 2660
Mean = 2660/80 = 33.25
Median = 30 + 10 * (40 - 27)/30
= 30 + 4.33
= 34.33
Mode = 30 + 10 *( 30 - 15)/(30 - 15 + 30 - 18)
= 30 + 5.55
= 35.55
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