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3 years ago

The amount of a phone bill and the length of the call. Which one is dependent?

1 answer:

8 0

The amount of the phone bill is dependent because depending on how long the call is the more money you will have to pay :)

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A laundry basket has 24 t-shirts in it. Four are navy,

Shtirlitz [24]

Answer:

The probability is of selecting a green shirt is 8

Step-by-step explanation:

24 - 4 = 20

20 - 12 = 8

4 0

2 years ago

ABCD is a trapezium with AB parallel to DC.

Julli [10]

Answer:

Step-by-step explanation:a or b ?

4 0

3 years ago

Discrete R.V. Assume a student shows up for EGR 280 completely unprepared and the instructor gives a pop quiz. Assume there are

Tom [10]

Answer:

a) p=0.2

b) probability of passing is 0.01696

c) The expected value of correct questions is 1.2

Step-by-step explanation:

a) Since each question has 5 options, all of them equally likely, and only one correct answer, then the probability of having a correct answer is 1/5 = 0.2.

b) Let X be the number of correct answers. We will model this situation by considering X as a binomial random variable with a success probability of p=0.2 and having n=6 samples. We have the following for k=0,1,2,3,4,5,6

$P(X=k) = \binom{n}{k}p^{k}(1-p)^{n-k} = \binom{6}{k}0.2^{k}(0.8)^{6-k}$ .

Recall that $\binom{n}{k}= \frac{n!}{k!(n-k)!}$ In this case, the student passes if X is at least four correct questions, then

$P(X\geq 4) = P(X=4)+P(X=5)+P(X=6)=\binom{6}{4}0.2^{4}(0.8)^{6-4}+\binom{6}{5}0.2^{5}(0.8)^{6-5}+\binom{6}{6}0.2^{6}(0.8)^{6-6}= 0.01696$

c)The expected value of a binomial random variable with parameters n and p is $E[X] = np$ . IN our case, n=6 and p =0.2. Then the expected value of correct answers is $6\cdot 0.2 = 1.2$

5 0

3 years ago

A football field is 160 feet wide and 360 feet in length. What is the distance around the field?

charle [14.2K]

Answer: 160 + 160 = 320

360 + 360 = 720

720 + 320 = 1040

6 0

3 years ago

A right triangle has sides 5.0 m, 12 m, and 13 m. the smallest angle of this triangle is nearest:

Crank

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3 years ago