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standard deviation

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khan2014
 
Reply Mon 11 Nov, 2013 06:39 am
Diastolic blood pressure is distributed normally in a group lady teachers (N=75). Means was 80mmHg and standard deviation of 10. Approximately what precentage of teachers have diastolic blood pressure of 70 mmHg or greater?
A. 16%
B. 34%
C. 48%
D. 84%
E. 96%
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Type: Question • Score: 0 • Views: 550 • Replies: 2
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engineer
 
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Reply Mon 11 Nov, 2013 09:06 am
@khan2014,
D

70 is one standard deviation less than the mean of 80, so it has a Z score of -1. If you look up -1 in a cummulative z score table, you will get 16%, so 16% have a blood pressure less than 70 -> 84% are greater.
khan2014
 
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Reply Thu 14 Nov, 2013 01:41 am
@engineer,
thanks alot bro, appreciate it.
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