Question

A teacher gave a quiz to her class of 30 students. However, she misplaced one of the quizzes. The teacher calculated the mean of the 29 quizzes to be μ = 68 points. At this point, the teacher found the missing quiz. On this quiz, the student scored 98 points. What is the mean for the class of all 30 students?

Answer 1

Answer:

mean of all 30 students is 69

Explanation:

given data

students = 30

mean = 29

μ = 68 points

student scored = 98 points

to find out

What is the mean for the class of all 30 students

solution

we know here mean score of 29 students is 68

so sum of score is here = 29 × 68

sum of score = 1972

so

sum of 30 students score is = sum of 29 students score + missing score

sum of 30 students score is = 1972 + 98

sum of 30 students score is = 2070

so

mean of all 30 students is = $\frac{sum of 30 students}{30}$

mean of all 30 students is = $\frac{2070}{30}$

mean of all 30 students is 69