# math

posted by
**Jon** on
.

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?