questions 1&4 HW6 Homework , 7.2 # 11 ac, 7.3 # 18, 19, 7.3 # 25 ad 1. Let x 5 r

Question

questions 1&4

HW6 Homework , 7.2 # 11 ac, 7.3 # 18, 19, 7.3 # 25 ad 1. Let x 5 red blood cell (RBC) count in millions per cubic millimeter of whole blood For healthy females, x has an approximately nomal distribution with mean m 5 4.8 and standard devia- tion s 50 3 (based on information from Diagnostic Tests with Nursing Implications, edited by S Loeb, Springhouse Press) Convert each of the following x intervals to z intervals (a) 45sx (b)x42 (c) 404x9 55 2. 18 Find z such that 3, 19 Find z such that 8% of the standard normal curve lies to the right of Z. 4 A person's blood glucose level and diabetes are closely related Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. After a 12-hour fast, the random variable x will have a distribution that is approximately normal with mean u-85 and standard deviation :25 Source Diagnostic Tests with Nursing Implications, edited by S. Loeb, Springhouse Press) Note: After 50 years of age, both the mean and standard deviation tend to increase What is the probability that, for an adult (under 50 years old) after a 12-hour fast, a. (a) x is more than 602 b. (b) x is less than 110 c (c) x is between 60 and 110? d. (d) x is greater than 140 (borderline diabetes starts at 1402 Pint F6 F7 F8 F9 F11 F12

Explanation / Answer

1)

a)therefore 4.5<x converted in z score -1<x

b)x<4.2  converted in z score z<-2

c) 4.0<X<5.5   converted in z score -2.667<Z<2.3333

4)

a)

b)

c)

d)

for normal distribution z score =(X-)/ here mean=       = 4.8 std deviation   == 0.3000

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