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To obtain the probability for U slash/x and O slash/x

A population has mean 325 and variance 144. Suppose the distribution of sample means is generated by random samples of size 36.
a) find U slash/x and O slash/x.
b) find P(slash/X  < 323).
c)  Find P(320 less/equal  (slash over x) less/equal 322).

Attached file(s)

Solution Attachment

Solution document is in Word format