A student obtained the following quiz scores: 90, 85, 93, and 78. What should be the minimum score he has to obtain in the fifth quiz to have an average of at least 80.

at least a 68

And this student should believe DADDY because ... ?

If DADDY truly wants to help, he should provide the process by which he arrived at his out-of-the-blue answer.

To find the minimum score the student needs to obtain in the fifth quiz, we can use the concept of averages.

To find the average score, we can sum up all the scores and divide it by the number of quizzes (in this case, 5). If the average needs to be at least 80, we can set up the following equation:

(90 + 85 + 93 + 78 + x) / 5 ≥ 80

In the equation above, x represents the score the student needs to obtain in the fifth quiz.

Let's solve the equation step by step:

Multiply both sides of the equation by 5 to eliminate the denominator:

90 + 85 + 93 + 78 + x ≥ 400

Combine the numbers on the left side of the inequality:

346 + x ≥ 400

Subtract 346 from both sides to isolate the variable:

x ≥ 400 - 346

x ≥ 54

Therefore, the minimum score the student needs to obtain in the fifth quiz to have an average of at least 80 is 54 or higher.