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January 31, 2015

January 31, 2015

Posted by **Eric** on Friday, April 27, 2012 at 8:43pm.

27. In a marketing survey involving 910 randomly chosen people, it is found that 550 use brand P, 360 use brand Q, and 90 use both brands. How many people in the survey use brand Q and not brand P?

- MATH URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -
**MathMate**, Friday, April 27, 2012 at 9:40pma.

This is a typical case of a hypergeometric distribution where

Suppose

N=total population, (unknown)

n=sample size (48)

a=total number of tagged birds (37)

x=number (18) of tagged birds out of n (48)

Then approximately,

x/n = a/N

or

N=an/x = 37*48/18 = 99 (approximately).

b.

Q\P=Q-Q∩P=360-90=370

- MATH URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -
**Kati**, Monday, May 7, 2012 at 11:30pmThe first question is 98.6666666, but if it is for a test, put "approximately 99".

The second question's answer is 270.

- MATH URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -
**Anonymous**, Monday, May 21, 2012 at 12:30pmi think the second answer is 315 because not all 90 people use brand Q. so take 90 divide by 2 then subtract.+

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