15%=3
5%=1
5(20)=100
1(20)=20
So, there are 20 students in the class.
Answer: 639
Step-by-step explanation:
Since

, we know that

follows a Poisson distribution with parameter

.
Now assuming

denote the mean and standard deviation of

, respectively, then we know right away that

and

.
So,
Step-by-step explanation:
x÷z46 ×32% = 546% sorry i rlly need points
I believe it's a , not sure though