Average height and variance of 5 students in a class is 150 and 8
Answers
Answered by
1
hey ⤵⤵
Given average height of 30 students = 150 cm Mean height = (sum of heights of students)/(Number of students) 150 = (sum of heights of students)/(30) Hence,↔
Sum of heights of students = 4500 cmGiven one observation is wrongly copied as 135 cm instead of 165 cm↔
Error in the entering the observation = 165 – 135 = 40 cm Hence correct sum of heights of students = 4500 +40 = 4540 cm↔
Correct mean height = 4540/30 = 151.33 (( Aproxxx ))✔✔
hope it helps u a lot ❤❤
Given average height of 30 students = 150 cm Mean height = (sum of heights of students)/(Number of students) 150 = (sum of heights of students)/(30) Hence,↔
Sum of heights of students = 4500 cmGiven one observation is wrongly copied as 135 cm instead of 165 cm↔
Error in the entering the observation = 165 – 135 = 40 cm Hence correct sum of heights of students = 4500 +40 = 4540 cm↔
Correct mean height = 4540/30 = 151.33 (( Aproxxx ))✔✔
hope it helps u a lot ❤❤
Answered by
10
Step-by-step explanation:
The average height of 12 students in a class is 150 cm.
Then, the sum of heights of 12students=12×150=1800cm²
The average height of the remaining 18 students in the class is 180 cm.
The, the sum of heights of remaining 18 students in the class=18×180=3240
Now, the total number of students in the class (n)=12+18=30
The total sum of the heights of students in the class S(n)=1800+3240=5040
Similar questions
English,
7 months ago
Political Science,
1 year ago