Probability

Tally owns 100 shares of stock in a toy company that was worth $149 per share. A month later, the stock market dropped and her shares were now worth $120 per share. What is the percent of decrease in the value of her stock?

• 15%
• 19%
• 20%
• 29%

The 6th grade sells flavored sugar cookies with nuts. How many choices are offered if each cookie has one flavor and one nut? Flavor choices: chocolate, cinnamon, or butterscotch Nut choices: pecans, walnuts, or almonds

• 9
• 10
• 11
• 12

Tom wanted to buy a new stereo. The store he wanted to buy it from was selling it for $459.99. This weekend they were discounting it by 15%. If the sales tax was 8%, what was Tom’s total cost to buy the stereo?

• $422.26
•  $422.27
• $422.28 
• $422.29

Bill has a bag of straws that contains 13 red, 12 blue, 15 yellow, and 8 green straws. If he picks a straw at random, what is the probability that the straw will be green or blue? 

• 1/24
•  1/6
• 1/4
• 5/12

Bob was playing a card game. Before discarding, he had 5 blue cards, 2 green cards, 3 red cards, and 1 gold card. If he discards 1 of his red cards, what percent of his remaining cards are green?

• 20%
• 18%
• 10%
• 2%

40% of a number is 42. What is 50% of that number? 

• 52.5
• 70
•  105
• 142

Kathy earns $7.25 an hour working part-time at the library. One week she worked 18 hours and 48 minutes. How much did she earn that week? 

• $130.50
• $136.30
• $137.30
• Not given

A birthday party at a paintball place cost $200 plus $6.00 per person. They also charge an 8% state tax on the total. What would be the total cost for a party if 30 people attend?

• $350.40
• $380.40
• $396.40
• $410.40

Find the next four numbers of the sequence 0, 1, 1, 2, 3, 5.… 

•  10, 14, 22, 36
• 12, 18, 21, 37
• 8, 13, 21, 34
•  14, 18, 21, 38

Willy has 18 marbles in a bag. He tried to give each of his six friends at least one marble but no two friends the same number of marbles. He doesn’t have enough to do this. What is the least number of additional marbles needed?

• 21
• 9
• 3
• none