math
posted by Jon .
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?
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