14. Still cranky? A company has developed an “easy- start" mower that cranks the engine with the
push of a button. The company claims that the
probability the mower will start on any push of
the button is 0.9. Assume for now that this claim
is true. On the next 30 uses of the mower, let Y =
the number of times it starts on the first push of
the button. Exercise 14 in Lesson 5.3 (page 355)
asked you to show that Y is a binomial random
variable.

Explain how you can use the associative property to evaluate (7x50)x4.

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?

Acontainer holds 0.7 liters of oil and vinegar. 3/4 of the mixture is vinegar. how many liters of oil are in the container? express your answer as both a fraction and a decimal.