Σ(- x i 1 9. Find the variance. Hint: S x п—1 10. Prove that when exam scores are weighted equally, the weighted mean is the same as the mean. 1.e. P n Σ. when scores are weighted equally XWi п i=1 i=1 n 11. The mean SAT (Scholastic Aptitude Test) score is 900 with a standard deviation of 200. According Chebyshev's Theorem at least what proportion of scores are between (a) 700 and 1100? (b) 500 and 1300? (c) 300 and 1500? п 12. Prove that the sum of the deviations from the mean is zero. i.e. Prove that (x- x) = 0. i-1 13. Use the following equation predicting pounds of garbage based on the number of people in the hou garbage = 10 household size+ 15 (a) Identify and interpret the slope. (b) Identify and interpret the intercept. (c) Find the residual of a household with 3 people which discarded 40 pounds of garbage. (d)Fill in the blank: The least squares linear regression line minimizes 14. One study showed a strong positive correlation between the number fire trucks sent to a fire and t

Q: 4. 10p-p-2

A: The given expression is : 10p2-p-2 To factorize the given expression.

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A:

Q: I already put .103 and it was incorrect.

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Q: It was not 126. I cannot figure it out

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Q: 1.

A:

Q: The product of an even number and any other number is even.

A: The product of an even number and any other number is even.

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A: Solution: The formulae for the combination is  nCr=n!r!×(n-r)!