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

## Answer this Question

## Related Questions

- algebra 2 - "for 2000 patients, blood-clotting time was normally distributed ...
- math - Age 0-14 number of people= 206,423 Age 15-34 number of people= 265,778 ...
- Statistics - Age 0-14 number of people= 206,423 Age 15-34 number of people= 265,...
- Statistics - If a completion time for a task is normally distributed with a mean...
- math - at one high school the mean time for running the 100-yard dash is 15.2 ...
- blood clotting - are blood clotting factors released from platelets, plasma, ...
- Math - The systolic blood pressures of the patients at a hospital are normally ...
- STATS - For Tommy Bench, a minor league pitcher, the times between pitches are ...
- statistics - According to a bank, the time taken by its customers to use cash ...
- Math 156 - The systolic blood pressures of the patients at a hospital are ...