Question

the mean of 8 numbers is minus 15 is earth number multiplied by 18 what is the number of number of number mean

Answer 1

Heya !!!



Let the observations are X1 , X2 , X3 , ........X8.



Mean = Sum of observations/Number of obver.





-15 = X1 + X2 + X3.......+X8 / 8




X1 + X2 + X3 .....+X8 = -15 × 8



X1 + X2 + X3 +.....X8 = -120



Each obsetvations are Multiplied by 18 . New observations are :


X1 × 18 , X2 × 18 , X3 × 18 ...,.......X8 × 18








Mean = Sum of obsetvations/Number of obser



Mean = X1 × 18 + X2 × 18 + X3 × 18.….....X8×18/8


Mean = 18( X1+ X2+ X3......X8)/ 8




Mean = 18 × -120/8


Mean = -288





HOPE IT WILL HELP YOU...... :-)