A professor has recorded exam grades for 40 students in his class, but one of the grades is no longer readable. If the mean score on the exam was 82 and the mean of the 39 readable scores is 84, what is the value of the unreadable score?

the correct answer is $7.38

step-by-step explanation:

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!

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step-by-step explanation: