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The mean weight of 500 male students in a certain college is 151 1b. and the standard deviation is 15 Ib. Assuming the weights are normally distributed, find how many students weigh between 120 and I55 1b.
(It is given that area under the standard normal curve between 2 = 0 and Z = 0.27 is 0.1064, that between Z =,0 and Z = 2.07 is 0.4808).
in Technology by Diamond (53,765 points) | 375 views

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image                                image

        = 120-151/15                                            =155-151/15

        =-2.0667                                                   = 0.2667

        =-2.07                                                       = 0.27

Z VALUE = 0.1923                                     Z VALUE = 0.6064

THEREFOR 

P (-2.07<Z<0.27) = 0.6064 - 0.1923

                            = 0.4141 X 100

                            = 41.41

                            = 41%

THE PROBABILITY OF HOW MANY STUDENTS WEIGH BETWEEN 120lb AND 155lb IS 41%

by Wooden (1,126 points)

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