C(9,5)

解答

C (9, 5)

126

求解步骤

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

代入

n = 9, r = 5

= \frac{9 !}{5 ! ( 9 - 5 ) !}

\frac{9 !}{5 ! ( 9 - 5 ) !} = 126

= 126

v a r ian ce 1.8, 2.5, 2.6, 4.4, 4.4, 7.3, 8, 9.5, 10.3, 10.4, 11.1, 11.7

in t er q u a r t i l e 300, 785, 670, 187, 760, 724

f i rs tq u a r t i l e 1, 4, 5, 5, 10, 25

f i rs tq u a r t i l e 1, 4, 6, 14, 20, 24, 25, 28, 29, 35, 38, 40, 40, 43, 44, 47, 48

s t d - 30, 0, 14, 25