Posted by Jon on Saturday, February 9, 2008 at 4:25pm.
2)For 2000 patients, a bloodclotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had bloodclotting times between 5 and 11 seconds?
A)68%
B)34%
C)49/5%
D)47/5%
I chose A
4)A music teacher wants to determine the music performances of students. A survey of which group would produce a random sample?
A)students in the school band
B)students attendeing the annual jazz concert
C)students in every oddnumbered homeroom
D)every other player on the baseball roster
is it A?

math  DanH, Saturday, February 9, 2008 at 4:31pm
2) A is correct
4): I think the point of this question is that the teacher wants a RANDOM sample of students. The only choice that would really give her a random sample would be C. All others are biased.

math  BIAO, Monday, September 5, 2011 at 5:51am
POITS A,B, AND C ARE COLLINEAR .AB=7CM BC =13CM WHATIS AC ANSWER
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