What is the average weight of a class of 20 students?

The average weight of a class of 20 students is 45kgs. A new student whose weight is 40kgs replaced an old student of this class. The average weight of the whole class decreases by 1 kg.

How do you calculate the number of students in a class?

Total number of students including the new set of students = m + 40. Consider a class of 40 students whose average weight is 40 kg. m new students, whose average weight is n kg, join this class. If it is known that m + n = 50, what is the maximum possible average weight of the class now?

What is the total weight of the initial set of students?

Total weight of the initial set of students = 40 × 40 = 1600 kg. Total weight of the new set of students = m n kg. ⇒ Total weight of the m + 40 students = 1600 + m n kg. It is given that m + n = 50 ⇒ n = 50 − m. = 1600 + 50 m − m 2. Total number of students including the new set of students = m + 40.

The average weight of 20 students in a class is increased by 0.75 kg when one student of 35 kg is replaced by a new student. What is the weight of the new student (in kg)? One student of 35 kg is replaced by other. 0.75 kg. The average weight of a class of 20 students is 50 kgs.

How is average weight of 25 persons increased by 1 kg?

Average weight of 25 persons is increased by 1 kg when one person weighing 60 kg is replaced by a new person. Weight of new the person is: A). 50 kg. B). 61 kg. C). 86 kg. D). 85 kg.

How to find the weighted average of two numbers?

1 Weighted average is the average of a set of numbers, each with different associated “weights” or values. 2 To find a weighted average, multiply each number by its weight, then add the results. 3 If the weights don’t add up to one, find the sum of all the variables multiplied by their weight, then divide by the sum of the weights.

What is the weighted average of a weighted Test score?

Calculating Weighted Average Test Score Assigned Weight Test Score Weighted Value 50 .15 7.5 76 .20 15.2 80 .20 16 98 .45 44.1

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