Posted by **Jon** on Saturday, February 9, 2008 at 4:25pm.

2)For 2000 patients, a blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had blood-clotting 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 odd-numbered 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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