السلام عليكم
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using cheby’s theorem calculate how many observation will fall in the
following intervel provided mean and standered deviation of 40 observation are 13 and 2 respectiveiy
a- interval 11-15?l
b- interva 9-15?l
c- interval 7-19?l
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wenday’s restaurant sells small medium and large sized soft drink for $0.90 , $1.25 , $1.50 respectively
Of the last 10 drinks sold , 3 were small, 4 medium, and 3 large sized .
calculate the waighted average of all the drinks sold
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Frequency class
10>0 8
20> 10 10
30>20 13
40>30 12
50>40 6
a- calculate mean and standerd deviation from above grouped data
b- calculate co-efficient of variation from the above data