Question

in a class of some students average score of students in mathematics examination is 49 and the total score of all students is 1225 find the number of students in the class​

Answer 1

Answer:

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Step-by-step explanation:

Given :-

average score in Mathematics of a class of 36 students is 60.

After Two to scores excluded average goes down by 2.

second highest score of the class is 90

Highest Score of Class ? .

Solution :-

→ Average marks of 36 Students = 60

→ Total Marks of Class = Average * Total Number of Students = 60 * 36 = 2160 . ---------Equation (1)

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Now, when Two Top scores Excluded.

→ Number of Students Left = 36 - 2 = 34 .

→ New Average = 60 - 2 = 58 .

So,

→ Total Marks of Students = 34 * 58 = 1972. ------ Equation (2)

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Subtracting Equation (2) From Equation (1) we get

→ Total Marks of Top Two Students = 2160 - 1972 = 188.

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Now, Given That, Second Highest score of Class is 90.

So,

→ Highest score of class = 188 - 90 = 98 (Ans).

Hence, Highest score of class is 98.

Answer 2

Answer:

The total number of students in the class is 25 (Answer)

Step-by-step explanation:

In a class of some student’s average score of students in mathematics examination is 49 and the total score of all students is 1225 find the number of students in the class.

Given:

Average Score in Mathematics = 49

Total Score = 1225

To Find:

Total Number of Students

We know that mean/Average  = (Sum of Observations)/(Total Number of Observations)

Average score in Mathematics = Mean = 49

Total Score = Sum of Observations = 1225

Total Number of Students = Total Number of observations =?

Substituting the values:

1225/(Total Number of Students)=49  

= Total Number of students=  1225/49=25

The total number of students in the class is 25 (Answer)