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1.The expression p(z<1.27 ) represents the area under the standard normal curve below the given value of Z. 

What is P(z<1.27) ? 

A. 0.1020

b. 0.1038

c. 0.8962

d.0.8980

 

2.The weights of apples in a bin are normally distributed with a mean of 143 grams and a standard deviation of 4.2 grams. 

 Approximately 30% of the apples weigh less than which amount? 

A. 133 G

b.135 G

c.137G

d. 141 G  

 Apr 12, 2019

Best Answer 

 #1
avatar+18963 
+3

From pos z-score table  1.27 corresponds to   .8980

 

 

From Negative z-score table  -.52    standard deviations represents fraction .3015

-.52 standard deviations below the mean is     143 - .52(4.2) = ~  141 gm

 Apr 12, 2019
 #1
avatar+18963 
+3
Best Answer

From pos z-score table  1.27 corresponds to   .8980

 

 

From Negative z-score table  -.52    standard deviations represents fraction .3015

-.52 standard deviations below the mean is     143 - .52(4.2) = ~  141 gm

ElectricPavlov Apr 12, 2019

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