If the numbers are 0-10 ,10-20, 20-30, 30-40. 40-50, 50-60,60-70,70-80 , 80-90, 90-100. so how to find assumed mean "A". In the text book the answer is 50.plz help
Arghya11:
plzzz give me a photo of page 50 and question number
so i can ans your qustion
okay I'm pasting the question please find my question and answer. Please
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find class mark (xi) of each class
x1 = (0+10)/2 = 10/2 = 5
x2 = (10+20)/2 = 30/2 = 15
similarly
x3 =25
x4=35
x5=45
x6= 55
x7=65
x8= 75
x9=85
x10=95
you can take any xi value as assumed mean.
generally we take middle value
in this problem assumed mean =A = 55
x1 = (0+10)/2 = 10/2 = 5
x2 = (10+20)/2 = 30/2 = 15
similarly
x3 =25
x4=35
x5=45
x6= 55
x7=65
x8= 75
x9=85
x10=95
you can take any xi value as assumed mean.
generally we take middle value
in this problem assumed mean =A = 55
but in digest A is 50
i think mean = 50 which is given. assumed mean different from mean which is given
after using the formula you can get mean =50
is it clear
yes. Thank you very much.
it's all right
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