OCR S2 2005 June — Question 2

Exam BoardOCR
ModuleS2 (Statistics 2)
Year2005
SessionJune
TopicNormal Distribution
TypeFind standard deviation from probability
2 A continuous random variable has a normal distribution with mean 25.0 and standard deviation \(\sigma\). The probability that any one observation of the random variable is greater than 20,0 is 0.75 . Find the value of \(\sigma\).
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