ass tolong donkk pake cara ya

maaf kalo tulisannya kekecilan

U6 - U2 = 22 - 10
= 12
Beda 2 sampai 6 = 12 / 4 = 3
(dari U2 sampai U6 = 10, 13, 16, 19, 22)
U1 = U2 - 10
= 0
U66 = U1 + 13 × 3
= 0 +39
= 39
Rata rata = 1/2 (0+39)
S66 = 66×rata2
= 33 × 39
= 1287