3/5 I think is the right number because there’s 60 boys and only 36 of them have a pet.
Answer:
B
Step-by-step explanation:
If you plug in -9 you will get -11 for both side.
6 : 10 = 3 : 5
24 : 40 = 3 : 5
36 : 60 = 3 : 5
42 : 70 = 3 : 5
A. 18 : 20 = 9 : 10 (incorrect)
B. 30 : 20 = 3 : 2 (incorrect)
C. 18 : 30 = 3 : 5 (correct)
D. 50 : 30 = 5 : 3 (incorrect)
The answer is C. 18 : 30
Hope this helps. - M
Answer:
9
Step-by-step explanation:
Answer:
Step-by-step explanation:
Given : The probability distribution of a random variable X.
To find : The mean, variance, and standard deviation of X.
Solution :
First we create the table as per requirements,
x P(x) xP(x) x² x²P(x)
4 0.3 1.2 16 4.8
2 0.1 0.2 4 0.4
0 0.3 0 0 0
-2 0.1 -0.2 4 0.4
-4 0.2 - 0.8 16 3.2
∑P(x)=1 ∑xP(x)=0.4 ∑x²P(x)=8.8
1) The mean of x is defined as
2) The variance of x is defined as
3) The standard deviation of x is defined as