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Math Help - AP Stats homework help?

  1. #1
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    AP Stats homework help?

    I have two questions on my AP stats homework assignment:

    Question 1:
    Six republicans and four democrats have applied for two open positions on a planning committee. Since all the applicants are qualified to serve, the city council decides to pick the two members randomly. What is the probablity that both come from the same party?

    A. 66/90 B. 52/90 C. 52/100 D. 42/90 E. 42/100

    Question 2:
    A national study found that the average family spent $422 a month on groceries, with a standard deviation of $84. The average amount spent on housing (rent or mortgage) was $1120 a month, with a standard deviation of $212. The expected total of a family spends on food and housing is 422+1120=$1542. What is the standard deviation of the total?

    A. $128 B. $148 C. $228 D. $295 E. Cannot be determined
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    Question 1:
    Six republicans and four democrats have applied for two open positions on a planning committee. Since all the applicants are qualified to serve, the city council decides to pick the two members randomly. What is the probablity that both come from the same party?

    A. 66/90 B. 52/90 C. 52/100 D. 42/90 E. 42/100
    If two Republicans are picked, then (\frac{6}{10})(\frac{5}{9})

    If two Democrats, then (\frac{4}{10})(\frac{3}{9})

    Add them to find your probability.
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  3. #3
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    Quote Originally Posted by Summergal213 View Post
    I have two questions on my AP stats homework assignment:

    Question 1:
    Six republicans and four democrats have applied for two open positions on a planning committee. Since all the applicants are qualified to serve, the city council decides to pick the two members randomly. What is the probablity that both come from the same party?

    A. 66/90 B. 52/90 C. 52/100 D. 42/90 E. 42/100

    Question 2:
    A national study found that the average family spent $422 a month on groceries, with a standard deviation of $84. The average amount spent on housing (rent or mortgage) was $1120 a month, with a standard deviation of $212. The expected total of a family spends on food and housing is 422+1120=$1542. What is the standard deviation of the total?

    A. $128 B. $148 C. $228 D. $295 E. Cannot be determined
    Making some reasonable assumptions I get \sqrt{84^2 + 212^2} \approx .....
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