Question

14 is the mean of 7 observations.20 is the mean of 8 observations. the mean of combine
set is given by​

Answer 1

Step-by-step explanation:

Mean of 7 obs. = Sum of 7 observations ÷ Total No

= 14

So Sum of 7 obser. =14 ×7=98

Similarly

Sum of 8 obser. =20×8=160

Total no of observation 7+8 = 15

Mean of 15 observation will be = (Sum of 7+sum of 8) ÷ 15

Mean of 15 obser. =(160+98) /15

=17.2 approx.