C(40,3)

解答

C (40, 3)

9880

求解步骤

= \frac{n !}{r ! ( n - r ) !}

代入

n = 40, r = 3

= \frac{40 !}{3 ! ( 40 - 3 ) !}

\frac{40 !}{3 ! ( 40 - 3 ) !} = 9880

= 9880

in t er q u a r t i l e 3.5, 10.4, 16, 21.7, 27.7

s t d 10, 12, 15, 18, 11, 13, 14, 16, 19, 20

s t d 1, 2, 3, 4, 5

v a r ian ce 7, 4, 2, 5, 8, 2, 4, 8, 6, 3

13 c 3