Posted by **Jon** on Saturday, February 23, 2008 at 1:54pm.

1)Find the standard deviation of the data set to the nearest tenth. (21,13,18,16,13,35,12,8,15)

A)16.8

B)7.8

C)7.3

D)5.7

I chose C

mean = 21+13+18+16+13+35+12+8+15/9

16.8

variance = (21-16.8)^2 = 17.64...did that with the rest and added them to get sqrt 53.7

standard deviation = sqrt 53.7

= 7.3

2)Find the exact value of sin165

A)(sqrt6) - (sqrt2)/4

B)(sqrt6) + (sqrt2)/4

C)(sqrt2) - (sqrt6)/4

D)(sqrt of sqrt6 - sqrt2)/4

I chose A

(in D, there is a sqrt over both the sqrt6 and sqrt2)

3)Use the Binomial Theorem to find the sixth term in the expansion of (m+2p)^7.

A)21m^2p^5

B)672m^2p^5

C)32m^2p^5

D)448mp^6

I chose A

7/(7-k)!k!^m7-kpk

7/(7-5)!5!^m7-5p5

7*6*5*4*3/5*4*3*2*1^m2p5

2520/120

21m^2p^5

- Math(don't worry about it) -
**Jon**, Saturday, February 23, 2008 at 5:17pm
Discard this post

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