The mean test score in a math class with 27 students was 72. A student who scored an 85 was moved to another class. What was the mean score of the remaining 26 students?
Answers
answer is = 71.5
mean test score of 1 students=72
test score of 27 students =27×72=1944
total test score scored by 27 students = 1944
student having score 85 was moved to another class so, remained test score of 26 students
=1944-85=1859
new mean = new total test score / no. of students now
=1859/26
=71.5
so , new mean is 71.5
Answer:
71.5
Step-by-step explanation:
mean test score of 27 students = 72
mean = sum of terms
no. of terms
i.e,. mean = sum of test scores of 27 students
27
mean = sum of test scores of 26 stud. + 85
27
72= sum of 26 students + 85
27
72x27= sum of 26 stud. +85
1944 - 85 = sum of 26 student. sum of test scores of 26 students= 1859
new mean when 1 student moved to another
class...
mean = sum of test scores of 26 students
26
mean = 1859
26
mean = 71.5
hence, new mean of 26 students = 71.5