204 exm3 sp10 key - Math 2040 Exam 3 spring 2010 Name_KEY_...

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Name ___KEY___________________ SHOW YOUR WORK TO RECEIVE CREDIT 1) As given in the exam three review sheet, list two characteristics of the normal distribution (other than the empirical rule) ___see exam three review________________________________ _________________________________________________________________ 2) Assume that infants after a typical gestation period of 37 to 43 weeks have a normal distribution of birth weights with = 3432 grams and = 482 grams. a) Find the probability that a randomly selected full term (37-43 week) infant will have a weight above 4000 grams. TI normalcdf(4000,10000,3432,482) PHStats normal mean 3432 std dev 482 prob for x> 4000 _.1193__ c) Find the probability that 11 randomly selected full term infants will have an average weight above 4000 grams. TI normalcdf(4000,10000,3432,482/ 11) PHStats normal mean 3432 std dev 145.33 prob for x> 4000 __4.648x10 -5 _ d) Find the 5th percentile of the birth weights TI invnorm(.05,3432,482) PHStats normal mean 3432 std dev 482 x value for cumulative percentage 5%. _2639_
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204 exm3 sp10 key - Math 2040 Exam 3 spring 2010 Name_KEY_...

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