Answer to Question #188907 in Statistics and Probability for Abhay Bhujbal

Question #188907

In a normal distribution, 8% of items are under 50 and 10% are over 60. Find the mean and standard deviation of the distribution. 


1
Expert's answer
2021-05-07T11:47:16-0400

Value of Z, corresponding to 0.5-0.08=0.42 are , is equal to 0.202


     "0.202=\\dfrac{50-\\mu}{\\sigma}"


      "\\Rightarrow \\mu-0.202\\sigma=50~~~~~~~~~-(1)"


Value of Z, corresponding to 0.5-0.10=0.40 are , is equal to 0.253


      "0.253=\\dfrac{60-\\mu}{\\sigma}"


    "\\Rightarrow \\mu-0.253\\sigma=60~~~~~~~~~-(2)"


Solving equation 1 and 2 we get-

"\\mu=10.39\\\\\n\n \\sigma=2.53"


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