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the weights of members of a baseball league are normally distributed with a mean of 176 pounds and a standard deviation of 11.4 pounds. Comsider a league membership of 120 members. 

 

How many of the members will weigh 165 pounds or more?

 

67

76

80

100

 Apr 3, 2019
 #1
avatar+20216 
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176 pounds - 165 pounds =  11 pounds      this is      11/ 11.6  standard deviation less than the mean = - .9483 z-score =~ .95 z score

 

 

 

Look at negative z-score table for the value under -.95 z-score  to find the fraction .1711

.1711 x 120 members = 20.53 members are LESS than 165#   that means      100 members weigh MORE than 165#

 Apr 4, 2019
 #2
avatar+1534 
0

was this correct?

 Apr 5, 2019

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