Math, asked by vedantagrawala8493, 1 year ago

Average height and variance of 5 students in a class is 150 and 8

Answers

Answered by Raunac
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 ❤❤
Answered by Anonymous
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

Now, the  \: average  \: height  \: of \:  a  \: student  \\ \:  in \:  that  \: class =  \frac{S(n)}{n}  \frac{5040}{30}  = 168cm

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