T m t nhóm 10 k s g m 6 k s hóa và 4 k s đi n ch n ng u nhiên 4 k s (ch n 1 l n). G i X là s k s đi n đ c ch n.Ừ ộ ỹ ư ồ ỹ ư ỹ ư ệ ọ ẫ ỹ ư ọ ầ ọ ố ỹ ư ệ ượ ọa)Tính xác su t đ tronh 4 ký s đ c ch n có đúng 2 k s đi n. Ấ ể ư ượ ọ ỹ ư ệb) Tính EX và VarX. C) L p b ng phân ph i xác su t c a X

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?