A number cube is rolled 360 times, and the results are recorded as follows: 96 ones, 31 twos, 49 threes, 76 fours, 45 fives, and 63 sixes. What is the experimental probability of rolling a 2 or a 3? (1 point)
Answer choices
0.16
0.22
0.37
0.78
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The experimental probability of rolling a 2 or a 3 is the number of times a 2 or a 3 is rolled divided by the total number of rolls.
Number of times a 2 or 3 is rolled: 31 + 49 = 80
Total number of rolls: 360
Experimental probability of rolling a 2 or a 3: 80/360 = 0.22
Therefore, the correct answer is 0.22.
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From a barrel of colored marbles, you randomly select 5 blue, 2 yellow, 3 red, 4 green, and 2 purple marbles. Find the experimental probability of randomly selecting a marble that is not yellow.
Answer choices
9/16
7/8
8/9
3/4
The total number of marbles in the barrel is:
5 + 2 + 3 + 4 + 2 = 16
The number of marbles that are not yellow is:
16 - 2 = 14
So the experimental probability of selecting a marble that is not yellow is:
14/16 = 7/8
Therefore, the correct answer is 7/8.
A number cube is rolled 360 times, and the results are recorded as follows: 96 ones, 31 twos, 49 threes, 76 fours, and 63 sixes. What is the experimental probability of rolling a 2 or a 3?
Answer choices
0.16
0.22
0.37
0.78
The experimental probability of rolling a 2 or a 3 is the number of times a 2 or a 3 is rolled divided by the total number of rolls.
Number of times a 2 or 3 is rolled: 31 + 49 = 80
Total number of rolls: 360
Experimental probability of rolling a 2 or a 3: 80/360 = 2/9 = 0.22 (rounded to the nearest hundredth)
Therefore, the correct answer is 0.22.
A survey showed that 62% of car owners prefer two-door cars, 26% prefer four-door cars, and 12% have no preference. You ask 400 people. How many do you think will prefer the two-door cars?
Answer choices
126 people
152 people
196 people
248 people
If 62% of car owners prefer two-door cars, then the estimated number of people who prefer two-door cars out of a sample of 400 people is:
0.62 x 400 = 248
Therefore, the answer is 248 people.
Hence, the correct answer is 248 people.
Tony works in a factory that produces 1,000 computers each day. When 50 computers were sampled, it was found that 7 were defective. Estimate how many defective computers are made each day.
Answer choices
140 computers
7 computers
169 computers
265 computers