Question 943887
Part A: First sample with M=4 and 7 scores Second sample M=8 with 7 scores
With average (mean)=4 with 7 scores would sum (4 x 7)=28
With average (mean)=8 with 7 scores would sum (8 x 7)=56
total points=28+56=84 total scores (7+7)=14 scores
so combined mean is 84 total points/14 scores=combined M=6 ANSWER A Mean=6
Part B:
With average (mean)=4 with 3 scores would sum (4 x 3)=12
With average (mean)=8 with 7 scores would sum (8 x 7)=56
Total points=12+56=68; total scores (3+7)=10 scores
so combined mean is 68 total points/10 scores=combined M=6.8 ANSWER B Mean=6.8
Part C:
With average (mean)=4 with 7 scores would sum (4 x 7)=28
With average (mean)=8 with 3 scores would sum (8 x 3)=24
Total points=28+24=52; total scores (7+3)=10 scores
so combined mean is 52 total points/10 scores=combined M=5.2 ANSWER C Mean=5.2