Mean of set of 30 observation is 75.if each obser is multiplied by no x then each is decreased by 25 their mean remain same. x is equal to
if each number is multiplied by x and decreased by 25, then the mean of the numbers also gets multiplied by x and decreased by 25. Let the original mean be A.
Then
AX-25=A
Given A=75
Substitute
75X-25=75
X=4/3
Hello Zareen
x comes out to be 4/3.
x1 +x2 +x3 + ......+ x30 = 75*30
X( x1 + x2 + x3 +.......+ x30) - 25*30 = 75*30
X(75*30) -25*30 = 75*30
X(75*30)= 30* ( 75+25)
X = 4/3.
Good luck.
Hello Zareen
x comes out to be 4/3.
x1 +x2 +x3 + ......+ x30 = 75*30
X( x1 + x2 + x3 +.......+ x30) - 25*30 = 75*30
X(75*30) -25*30 = 75*30
X(75*30)= 30* ( 75+25)
X = 4/3.
Good luck.
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