#3.
0 × 5 = 0
1 × 9 = 9
2 × 7 = 14
3 × 4 = 12
4 × 3 = 12
5 × 2 = 10
-------------------add
0 + 9 + 14 +
12+12+10 = 57
57/ 30 (people)
= 1.9 ………
so mean (average) = 1.9
#4
0x0=0
1x8=8
2x12=24
3x6=18
4x4=16
5x2=10
--------------add
0+8+24+18+16+10=76
76 /32 (people) = 2.375
or
=
2.38
so Mean (average) = 2.375 or 2.38
#5
Midpoint Midpoint
times frequency
0 < A
≤ 10 =5 5 x 38 = 190
10 < A
≤ 25 = 17.5 17.5 x 36 = 630
25 < A
≤ 40 = 32.5 32.5 x 30
= 975
40 < A
≤ 60 = 50 50 x
46 = 2300
------------------------------add
= 4095
Frequency =
38+36+30+46 = 150
4095 / 150 = 27.3
So mean = 27.3
