A teacher recorded the marks of 40 students in a test (out of 100). Classes 0-20, 20-40, 40-60, 60-80, 80-100 have frequencies 4, 6, 10, 12, 8. Find the mean marks using the direct method.

Question

Accepted Answer

57. Class marks: 10,30,50,70,90. fi*xi = 4*10+6*30+10*50+12*70+8*90 = 40+180+500+840+720 = 2280. sum fi = 40. Mean = 2280/40 = 57.

A teacher recorded the marks of 40 students in a test (out of 100).
Classes 0-20, 20-40, 40-60, 60-80, 80-100 have frequencies 4, 6, 10, 12, 8.
Find the mean marks using the direct method.

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More Class 10 Mean of Grouped Data practice

A teacher recorded the marks of 40 students in a test (out of 100).Classes 0-20, 20-40, 40-60, 60-80, 80-100 have frequencies 4, 6, 10, 12, 8.Find the mean marks using the direct method.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Mean of Grouped Data practice

A teacher recorded the marks of 40 students in a test (out of 100).
Classes 0-20, 20-40, 40-60, 60-80, 80-100 have frequencies 4, 6, 10, 12, 8.
Find the mean marks using the direct method.