MathMaster logo

MathMaster

  1. Home
  2. general
  3. the average for the math test is 9 8 if we do not count the lowest grade of 5 on this test the average will be 10 what is
Question

The average for the math test is 9.8. If we do not count the lowest grade of 5, on this test, the average will be 10. what is the number of students in the class

206

likes
1029 views

Answer to a math question The average for the math test is 9.8. If we do not count the lowest grade of 5, on this test, the average will be 10. what is the number of students in the class

Expert avatar
Murray
4.5
92 Answers
If we denote the number of students by n , the total sum of all grades is 9.8n . When we exclude the lowest grade of 5, the number of students lowers to n-1 , and the new sum is 9.8n - 5 . With the new average being 10, we can write the equation:

10(n-1) = 9.8n - 5 .

Solving for n :

10n - 10 = 9.8n - 5 ,

10n - 9.8n = 10 - 5 ,

0.2n = 5 ,

n = \frac{5}{0.2} ,

n = 25 ,

n = 25 ,

Hence, the number of students in the class is n=25 .

Frequently asked questions (FAQs)
What is the length of the side opposite a 45° angle in a triangle with two sides measuring 9 and 12?
+
Math question: How many ways can a committee of 4 members be chosen from a group of 10 people?
+
Math question: How many pairs of angles in Triangle ABC are equal to the corresponding angles in Triangle XYZ?
+
New questions in Mathematics
Jose bought 3/4 of oil and his sister bought 6/8, which of the two bought more oil?
What is the amount of interest of 75,000 at 3.45% per year, at the end of 12 years and 6 months?
Suppose 56% of politicians are lawyers if a random sample of size 873 is selected, what is the probability that the proportion of politicians who are lawyers will be less than 55% round your answer to four decimal places
2x-4y=-6; -4y+4y=-8
A regional candy factory sells a guava roll at a price of $48, the monthly fixed costs amount to $125,000 and the variable cost for making a guava roll is $28. Determine: a) The equation of the total income from the production of guava rolls.
If f(x,y)=6xy^2+3y^3 find (∫3,-2) f(x,y)dx.
89, ÷ 10
3.24 ÷ 82
Use a pattern approach to explain why (-2)(-3)=6
Using the bank and exact method, calculate the interest on capital 10000 at 12% annual nominal interest rate for the period from 15.3. 2016 until 10/10/2016
Buffalo Company makes and sells shampoo. Each unit requires $1.40 labor costs, material costs per unit are $0.90 and other variable costs are $0.30. It sells shampoo for $4.45 to retailers. Fixed costs are $15,000. It sold 25,000 units in the current month. What is the Break-Even point in units? What is the Break-Even point in dollars? What is the contribution margin of Buffalo Company?
effectiveness of fiscal and monetary policy under closed and open economies
2x2
A diamond ring was reduced from $999.99 to $689.99. Find the percent reduction in the price. Round the answer to the nearest tenth of a percent, if necessary.
if y=1/w^2 yw=2-x; find dy/dx
a coffee shop has 9 types of creamer and 11 types of sweetener. In how any ways can a person make their coffee?
A candy manufacturer must monitor deviations in the amount of sugar in their products They want their products to meet standards. They selected a random sample of 20 candies and found that the sandard deviation of that sample is 1.7. What is the probabilty of finding a sample variance as high or higher if the population variance is actually 3277 Assume the population distribution is normal.
question 1 Consider a sample space S, and two events A and B such that P(A ∩ B) = 0.2, P(A ∪ B) = 0.6, P(B ∪ ̄A) = 0.8 (a) [0.5 points] Calculate P (A). (b) [0.5 points] Calculate P (B)
-1/3x+15=18
g(x)=3(x+8). What is the value of g(12)

You might be interested in