Chapter 3: Probability (Add and Mult) Jonathan Hill Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 87 people in the 18-21 age bracket and finds that 74 of them respond and 13 refuse to respond. When 273 people in the 22-29 age bracket are contacted, 251 respond and 22 refuse to Question 1 1/1 pt 9 2 98 respond. Assume that 1 of the 360 people is randomly selected. Find the probability of getting someone in the 22-29 age bracket or someone who does not respond. Giving a test to a group of students, the grades and gender are summarized below Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol. A B C Total Male 2 3 11 16 P(22-29 or does not respond) = % Female 12 10 13 35 Total 14 13 24 51 (Hint: It might be helpful to organize the data into a table first.) Question Help: Message instructor If one student is chosen at random, Find the probability that the student was NOT a female that got a "A" . Question 4 0/1 pt '5 3 2 99 39 51 A jar contains 10 red marbles numbered 1 to 10 and 12 blue marbles numbered 1 to 12. A marble is drawn at random from the jar. Find the probability of the given event, please show your answers as reduced fractions. Question Help: Message instructor (a) The marble is red. P(red)= Question 2 1/1 pt 9 2 99 (b) The marble is odd-numbered. P(odd)= Giving a test to a group of students, the grades and gender are summarized below A B C Total (c) The marble is red or odd-numbered. P(red or odd) = Male 10 18 32 Female 6 15 7 28 Total 10 25 25 60 (d) The marble is blue or even-numbered. P(blue or even) = Question Help: Message instructor If one student is chosen at random, . Question 5 0/1 pt 9 3 99 Find the probability that the student was female AND got a "B". Events A and B are indpendent events. Find the indicated Probability. P(A) = 0.3 Question Help: Video Message instructor P(B) = 0.8 Question 3 0/1 pt 9 3 99 P(A and B) = Question Help: Video Message instructor