Question: data 3. A process is normally distributed. If the standard deviation is 4 and P(X > 20) = 0.05. Find the mean. (3 marks) 10=4

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3. A process is normally distributed. If the standard deviation is 4 and P(X > 20) = 0.05. Find the mean. (3 marks) 10=4 Given, P (X720)= 6.05 6.56- 20-X DP ( 217 21 )-0.05 66 580-X How, P (X-MBHIS 720 - M = 10.05 -X From Standard! normal table 14 M = 20 ( 4 ) (1 .1 21= 1. 645, P ( Z.L ZD)0, 05 13.44- 714= 13.42

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