Given that,
Total number of children = 65
The ratio of boys to girls is 3 :2.
To find,
The number of girls in the grade.
Solution,
Let there are 3x girls and 2x boys.
ATQ,
3x + 2x = 65
5x = 65
x = 13
So, no of girls = 3x
= 3(13)
= 39
Hence, there are 39 girls in the grade.
Answer:
500w + 25 = 200
Step-by-step explanation:
"He withdraws $25 per week..." <------
Solution :
It is given that :
Number of students in a random sample majoring in communication or psychology at an university = 250
Total number of students majoring in psychology = 100
Number of students majoring in psychology those who are happy = 80
So number of students majoring in psychology those who are not happy = 20
Total number of students majoring in communication = 250 - 100 = 150
Number of students majoring in communication those who are happy = 115
So number of students majoring in psychology those who are not happy = 35
a). Probability of the students happy with their major choices are
![$=\frac{80+115}{250}$](https://tex.z-dn.net/?f=%24%3D%5Cfrac%7B80%2B115%7D%7B250%7D%24)
= 0.78
b). Psychology major ![$=\frac{80+20}{250}$](https://tex.z-dn.net/?f=%24%3D%5Cfrac%7B80%2B20%7D%7B250%7D%24)
= 0.4
c). Probability of the students who are happy with the communication as the choice of major =
= 0.46
d). Students unhappy with their choice of major given that the student is psychology major =
= 0.018