A student has gotten the following grades on his tests. What is the minimum grade he must get on the last test in order to have
1 answer:
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Solution: We are given that a basket contains three green apples and six red apples.
Three apples are randomly selected from the basket.
Now the probability of selecting first apple green is
The probability of selecting second apple green is
The probability of selecting third apple green is
Therefore, the probability of selecting three green apples is:
or 1.19%
Now how many red apples must be added to the basket in order to make the above probability smaller than 0.1%
If we add 11 red apples to the basket, then there will be 17 red apples and 3 green apples in the basket. Therefore, the probability of selecting three green apples if three apples are randomly selected is:
or 0.09%
Therefore, we need to add 11 red apples to the basket to make this probability smaller than 0.1%
Question:
Devin is having trouble with his assignment. His shown work is as follows:
However, this answer does not match the answer that his teacher gives him.
What is Devin’s mistake?
Answer:
See Explanation Below
Step-by-step explanation:
Given
Required
Spot and correct the mistake
Devin's mistake is in between step 1 and step 2.
To divide fractions;
You start by converting the division sign to multiplication sign.
But when doing this, you have to consider that the denominator and numerator of the second fraction will swap positions.
So, Devin's mistake is at
Because he didn't swap the position of 5 and 3 in the second fraction when changing the division to multiplication.
His calculation should be as follows
If he wishes to leave his answer in decimal, it'll be