there are 30 students in a class.the mean of mathematics score ofmale students is 75,while the mean of mathematics score of female students is 70.if the number

Total students = 30
Male students = 18
Female students = 30 - 18 = 12

Mean of mathematics score of male students = 75
Mean of mathematics score of female students = 70

Mean = {(75 × 18) + (70 × 12)} ÷ (18 + 12)
Mean = (1350 + 840) ÷ 30
Mean = 2190 ÷ 30
Mean = 73

The mean of mathematics score in class is 73.

[tex]\displaystyle Statistics \ [VIII] \\ \\ mean = \frac{f1.x1+f2.x2}{f} \\ where : f1 = the \ number \ of \ male \ students \\ x1 = the \ mean \ of \ mathematics \ score \ of \ male \ students \\ f2 = the \ number \ of \ female \ students \\ x2 = the \ mean \ of \ mathematics \ score \ of \ female \ students \\ f = total \ numbers \ of \ students \\ \\ mean = \frac{18.75+(30-18).70}{30} = 73 \xrightarrow \ Answer [/tex]