tolong ya 1-3 dengan caranya :)

1) rata2 = [(44,5 × 4) + (54,5 × 6) + (64,5 × 10) + (74,5 × 4) + (84,5 × 4) + (94,5 × 2)]/30

= [178 + 327 + 645 + 298 + 338 + 189]/30
= 1975/30
= 65,83 (A)

2) Tb = 30 - 0,5 = 29,5
d1 = 11 - 7 = 4
d2 = 11 -10 = 1
C = 5

Rumus modus
Mo = Tb + [d1/(d1 + d2)] × C
Mo = 29,5 + [4/(4 + 1)] × 5
Mo = 33,5 (E)

3) Tb = 29,5
n = 32
F = 2 + 8 = 10
f = 12
C = 10

Rumus median
Me = Tb + [(1/2 n - F)/f] × C
Me = 29,5 + [(16 - 10)/12] × 10 (D)

*rajin-rajinlah belajar dan mengerjakan soal ^^ semangat*