Một hộp đựng 12 bóng đèn, trong đó có 5 bóng đèn bị hư. Lấy ngẫu nhiên từ hộp ra 2 bóng đèn. Gọi X là số bóng đèn bị hư lấy được trong 2 bóng đèn lấy ra. Tìm E(X); D(X) và mod X.

Abag of jelly beans contain 13 pink, green, 20 yellow, 10 black, 7 red, and 11 orange jelly beans. approximately what percent of the jelly beans are pink and yellow?

What is the radical expression that is equivalent to the expression 27 1 over 5?

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true