Question

If mean is 41, Find out missing size from the following

Size: 20, 30, ?, 50, 60, 70

No. of Students: 8, 12, 20, 10, 6, 4​

Answer 1

class

class intervals fi cf

10-20 8 8

20-30 12 20

30-40 20 40

40-50 10 50

50-60 6 56

60-70 4 60

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60

can you give formula