In a class of 30 students, on average, 4 will be left-handed. If a class includes 10 "lefties", estimate how many students are in the class.
not even close. Watch your decimal points!
x/10 = 30/4
x = 300/4
not x = 3/4
x/10 = 30/4
Now just find x
0.75?
it's 3/4? Oh! I see what it did.
To estimate how many students are in the class, we can use the average proportion of left-handed students and the total number of left-handed students given.
Let's assume that the proportion of left-handed students in the class is constant.
The average proportion of left-handed students is given as 4 out of 30, or 4/30.
We also know that there are 10 left-handed students in the class.
To estimate the total number of students, we can set up a proportion using the average proportion and the known number of left-handed students:
(4/30) = (10/x)
Where x represents the total number of students in the class.
To solve for x, we can cross multiply:
4 * x = 30 * 10
x = (30 * 10) / 4
x = 300 / 4
x = 75
Therefore, based on the estimation, there are approximately 75 students in the class.