Question 8: In a certain country, the probability that a woman reaches the age of 70 is 0.7 and the probability that a woman lives to be 80 is 0.5. (a) If a woman from that country is 70 years old, what is the conditional probability that she will survive to 80 years? (b) Suppose that three sisters born in that country live completely independent lives. What is the probability that they will all be alive at the age of 70? (c) If the three sisters are all alive at the age of 70, what is the probability that they will all be alive at the age of 80?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

What is the length and width of a 84.5 square foot rug? will mark

Aconcession manager at yankee stadium wants to know how temperature affects beer sales. she took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. temperature 80 68 78 79 87 74 86 92 77 84 number of beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742 a. draw a scatter plot of the data. b. the manager estimates the regression equation to be: numberofbeers = −100, 678 + 1, 513 ∗ temperature draw this on your scatter plot. c. for one of the estimated points, indicate the residual with ei . d. for that same point, indicate what part of the variation is explained by the model with ˆyi − y¯.