Answer:
a) 20.61%
b) 21.82%
c) 42.36%
d) 4 withdrawals
Step-by-step explanation:
This situation can be modeled with a binomial distribution, where p = probability of “success” (completing the course) equals 80% = 0.8 and the probability of “failure” (withdrawing) equals 0.2.
So, the probability of exactly k withdrawals in 20 cases is given by

a)
We are looking for
P(0;20)+P(0;1)+P(0;2) =

0.0115292150460685 + 0.0576460752303424 + 0.136909428672063 = 0.206084718948474≅ 0.2061 or 20.61%
b)
Here we want P(20;4)

c)
Here we need

But we already have P(0;20)+P(0;1)+P(0;2) =0.2061 and

d)
For a binomial distribution the <em>expectance </em>of “succeses” in n trials is np where p is the probability of “succes”, and the expectance of “failures” is nq, so the expectance for withdrawals in 20 students is 20*0.2 = <em>4 withdrawals.</em>
For this case, the first thing we must do is define variables.
We have then:
x: number of hours
y: Amount of scarf that Sara knits
We then have the following equation that models the problem:

The number of hours during the 8 days is given by:

Substituting the value of x in the ada equation we have:

Answer:
she will knitted by the end of the trip about 52528mm of scarf
Answer:
Step-by-step explanation:
2/sin25=AB/sin90
AB=4.73
There are 16 oz in a pound so 16*.75=12
Answer:
Step-by-step explanation:
y = 3x - 5.....input values are x and output values are y
so if ur input (x) is 2.....sub 2 in for x and find ur output (y)
y = 3x - 5
y = 3(2) - 5
y = 6 - 5
y = 1 <=== ur output value