A jar contains black marbles and green marbles. Sixty percent of the marbles in the jar are green. A number generator simulates
randomly selecting 10 marbles from the jar. The number generator is used 12 times and the number of green marbles in each trial is shown in the dot plot. Which description is correct about the number generator being fair or not?
1 answer:
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Answer:
The number of textbooks of each type were sold is <u>134 math </u>and <u>268 psychology </u>books.
Step-by-step explanation:
Given:
Total number of math and psychology textbooks sold in a week is 402.
Now, let the number of math textbooks sold be .
And, the number of psychology textbooks be .
According to question:
Dividing both sides by 3 we get:
So, total number of math textbooks were 134 .
And, total number of psychology textbooks were
.
Therefore, the number of textbooks of each type were sold is 134 math and 268 psychology books.