Probability Review

What is probability of rolling 2 number cubes and getting a sum of 2

• impossible
• unlikely
• likely
• certain

Carl is conducting a survey for the school paper.  He finds that 7 students have no pets, 15 have one pet, and 9 have at least two pets.  What is the experimental probability that the next student Carl asks will not have a pet?

• 7/31
• 1/3
• 9/15
• 7/945

In a class, 5 students own smartphones and 11 students do not. What is the experimental probability that a randomly chosen student owns a smartphone?

• 68.75%

• 45.45%

• 31.25%

• 2.2%

A spinner with 10 equal sections numbered 1 through 10 is spun.  Find P(multiple of 3)

• 10%
• 70%
• 0%
• 30%

Sabrina has a list of 8 CDs and 5 DVDs she would like to buy.  Her friends randomly select one of the items from the list to give her as a gift.  What is the probability Sabrina's friends will select a DVD?

• 5/8
• 13/40
• 5/13
• 8/13

In the school chorus there are 38 sopranos, 53 altos, 44 tenors and 17 basses.  If Mrs. LeBrecht chooses one member of chorus at random to sing a solo in the spring concert, what is the probability that it will not be a soprano?

• 0.25
• 0.75
• 0.33
• 0.67

In his last 12 at bats, a baseball players has gotten a hit 5 times, walked 3 times and gotten out 4 times.  Over his next 480 at bats, how many hits can his coach expect him to get?

• 200
• 60
• 160
• 120

Describe the likelihood of rolling a 7 on a standard number cube.

• Unlikely
• As likely as not
• Certain
• Impossible

At a banquet dinner, 8 people at a table decided to order dessert while 12 did not. If there are 210 people attending the banquet, how many do you expect to order dessert?

• 158

• 157

• 84

• 53

Mallory spun this spinner 15 times and her results were: 3, 5, 2, 1, 3, 6, 7, 8, 8, 2, 6, 3, 6, 8, 7. What is the experimental probability that she will spin a 4 on her next spin?

• 12.5%
• 6.7%
• 26.7%
• 0%