1. Let X be a random variable with normal distribution having u=30.9 and o?=8.41. A random sample of 15 items was taken. Calculate (a) Pr ( -2.5< Z <2.5_ ) (b) Pr ( 29.4< X <32.4 ) (c) Pr ( -1.467< X-µ <1.467 )

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1. Let X be a random variable with normal
distribution having µ=30.9 and o²=8.41. A
random sample of 15 items was taken.
Calculate
(a) Pr ( -2.5< Z <2.5 )
(b) Pr ( 29.4< X <32.4 )
(c) Pr ( -1.467< X-u <1.467 )
Transcribed Image Text:1. Let X be a random variable with normal distribution having µ=30.9 and o²=8.41. A random sample of 15 items was taken. Calculate (a) Pr ( -2.5< Z <2.5 ) (b) Pr ( 29.4< X <32.4 ) (c) Pr ( -1.467< X-u <1.467 )
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