The average height of a class of students is 134.7cm. The sum of all the heights is 3771.6 cm. There are 17 boys in the class. How many girls are in the class?
Let's solve this step by step.
Step 1: Find the total number of students in the class.
To do this, we need to divide the sum of all the heights by the average height. So, let's divide 3771.6 cm by 134.7 cm.
3771.6 cm / 134.7 cm = 28
So, there are a total of 28 students in the class.
Step 2: Find the number of boys in the class.
We know that there are 17 boys in the class.
Step 3: Find the number of girls in the class.
To find the number of girls, we need to subtract the number of boys from the total number of students.
Number of girls = Total number of students - Number of boys
Number of girls = 28 - 17
Number of girls = 11
Therefore, there are 11 girls in the class.
To find the number of girls in the class, we need to subtract the number of boys from the total number of students in the class.
We know that the average height of the class is 134.7cm, and the sum of all the heights is 3771.6 cm. This means that the total number of students in the class can be found by dividing the sum of all the heights by the average height:
Total Number of Students = Sum of Heights / Average Height
Total Number of Students = 3771.6 cm / 134.7 cm
Total Number of Students ≈ 28
Since there are 17 boys in the class, we can subtract this number from the total number of students to find the number of girls:
Number of Girls = Total Number of Students - Number of Boys
Number of Girls = 28 - 17
Number of Girls = 11
Therefore, there are 11 girls in the class.
Mean = sum of scores/number of scores
134.7 = 3771.6/(x+17)
Solve for x. Hint: start by multiplying both sides by x+17.
I hope this helps. Thanks for asking.