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oksian1 [2.3K]
3 years ago
9

distribution of grades over the past two years is as follows: GRADE NUMBER OF STUDENTS A 80 B 75 C 90 D 30 F 25 Total 300 If thi

s past distribution is a good indicator of future grades, what is the probability of a student receiving a C in the course
Mathematics
1 answer:
diamong [38]3 years ago
3 0

Answer:

The probability of a student receiving a C in the course is p=0.3.

Step-by-step explanation:

We have a absolute frequency for each of the grades (A to F), of a total of 300 course tests.

It is assumed that this sample gives a dood estimation of the distribution of the grades. Then, we can estimate the probability of obtaining a C in the course usign the relative frequency for C.

The relative frequency is calculated as the division between the absolute frequency (in this case, 90 for a C grade) and the size of the sample (in this example, 300).

p_C=\dfrac{X_C}{N}=\dfrac{90}{300}=0.3

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The sign that would make the statement true is the division sign which would then make the full expression, (3 × 7) ÷ 21 = 1.

<h3>How to find the sign?</h3>

The statement given is (3 × 7) 21 = 1. There is therefore a need to find the sign that would be between the brackets and "21" which would lead to the answer being 1.

The brackets have to be solved first according to the PEMDAS rule which calls for parenthesis being solved first.

Solving the expression in the brackets gives:

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