What are the formula for the mean of grouped data???

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What are the formula for the mean of grouped data???

2007-03-15 23:35:47 · 3 answers · asked by PANCAKE LOVER 04 1 in Science & Mathematics ➔ Mathematics

3 answers

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x = (Σfx)/(Σf)
= A + (Σfd)/(Σf)

where Σ = sum
x = mid value of the class interval
f = frequency of the interval
A = assumed mean
d = deviation from A

2007-03-15 23:58:51 · answer #1 · answered by math freak 3 · 0⤊ 0⤋

Work out the middle of each group multiplied by the frequency of that group. Add all of these and then divide by the total of the frequencies.

2007-03-16 06:59:03 · answer #2 · answered by mathsmanretired 7 · 0⤊ 0⤋

the best way 2 use is direct method ,first multiply frequency by xi then add it up divide it by sum of frequency

mean=Zigma fixi/sum of fi

2007-03-16 07:22:07 · answer #3 · answered by vimal 1 · 0⤊ 0⤋