Question

Find the mean and standard deviation of the following

Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80

No. of students 5 10 20 40 30 20 10 4​

Answer 1

Answer:

the mean is 39.38848

and by step derivation method

first find class Mark by adding lower limit + upper limit divided by 2

then find fidi

then apply the formula x bar =a+sigma fidi by sigma fi

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Answer 2

mate, here is ur answer

n= 139.

mean. = sigma fixi ÷ n

= 39.39

S = 15.69

Step-by-step explanation:

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