A mathematics professor lost a test paper belonging to one of her students. she remembered that the mean score for the class of
1 answer:
The mean score of class of 40 was 85.
Using the formula of mean, we can write:
This is the sum of scores of the entire class i.e.40 students. Professor also knows the sum of scores of remaining 39 students. If she subtracts the sum of scores of 39 students from the sum of scores of 40 students, she can find the test scores of her student.
So, the test score of her student = 3400 - 3310 = 90.
This means the grade on the paper she lost was 90 .
Using the formula of mean, we can write:
This is the sum of scores of the entire class i.e.40 students. Professor also knows the sum of scores of remaining 39 students. If she subtracts the sum of scores of 39 students from the sum of scores of 40 students, she can find the test scores of her student.
So, the test score of her student = 3400 - 3310 = 90.
This means the grade on the paper she lost was 90 .
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3 to the negative second power is written like this: 
.
When simplifying an expression with a negative exponent, you take a positive version of the exponent, in this case that would be 2, and apply that to the base.
After doing that, we have 9.
The next step is to put one over that number.
In this case, now after doing that the answer is
.
Hope this helps!
When simplifying an expression with a negative exponent, you take a positive version of the exponent, in this case that would be 2, and apply that to the base.
After doing that, we have 9.
The next step is to put one over that number.
In this case, now after doing that the answer is
Hope this helps!