Sheet # 241
Name: _____________________ Date_____________
Show your work.
1) A jar contains 60 equal sized marbles, of which 35 are white, and 25 are black. You take one marble from the jar without looking.
a) What is the probability of picking a black marble?
b) What is the probability of picking a red marble?
2) A jar contains 6 red gumballs, 4 white gumballs, and 10 blue gumballs. One gumball is drawn at random from the jar. What is the probability of getting a gumball that is NOT red?
3) The spinner consists of a circle cut into 8 equal wedges, labeled clockwise: blue, yellow, red, blue, red, blue, yellow, red.
a) Is it a fair spinner?
b) Is probability of getting yellow more or less likely than red? Why?
c). Is probability of getting blue equal, more, or less likely than red? Why?
Answers for sheet # 241
1) Total number of marbles = 60
a) Probability of picking up a black marble = 25/60 = 5/12
b) Probability of picking up a red marble = 35/60 = 7/12
2) Total number of gumballs = 6 + 4 +10 = 20 gumballs
Probability of getting not red = probability of getting blue + probability of getting white
= (4/20) + (10/20) = 14/20 = 7/10
3) 8 wedges in all.
Blue = 3
Yellow = 2
Red = 3
a) No, it is not a fair spinner as there are fewer yellow wedges or area than blue or red.
b) Probability of getting yellow is less than red because there are only two yellow wedges while there are three red wedges.
c) The probability of getting blue is the same as the probability for red because the number of blue wedges equal the number of red wedges.