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Anit [1.1K]
4 years ago
5

Suppose that the probabilities of a customer purchasing​ 0, 1, or 2 books at a book store are 0.2​, 0.4​, and 0.4​, respectively

. what is the expected number of books a customer will​ purchase? the standard deviation of the​ customer's book purchases is
Mathematics
1 answer:
Alla [95]4 years ago
6 0
Porobability distribution of X
x      P(x)
0       0.2
1       0.4
2       0.4
Total .1.0
i] Expectation
Mean=Σxp
Variance=x²p-(∑xp)²
thus:
Mean=(0*0.2)+(1*0.4)+(2*0.4)
=0+0.4+0.8
=1.2

ii] Variance
Variance=[(0²*0.2)+(1²*0.4)+(2²*0.4)]-(1.2)²
=[0+0.4+1.6]-1.44
=0.56
hence:
standard deviation=sqrt(0.56)=0.74833
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A survey is taken among customers of a fast-food restaurant to determine preference for Hamburger and Cheeseburger. Of 180 respo
stiv31 [10]

Using it's concept, it is found that the probabilities are given as follows:

a.1/2, 1/9, 5/9.

<h3>What is a probability?</h3>

A probability is given by the <u>number of desired outcomes divided by the number of total outcomes</u>.

In this problem, 90 out of 180 individuals are children, hence the probability is given by:

p = 90/180 = 1/2.

Out of 90 adults, 60 - 50 = 10 preferred cheeseburgers, hence the probability is given by:

p = 10/90 = 1/9.

Of the 180 individuals, 90 are children, and 10 are adults who prefer cheeseburgers, hence the probability is given by:

p = 100/180 = 10/18 = 5/9.

Hence option a is correct.

More can be learned about probabilities at brainly.com/question/14398287

#SPJ1

5 0
2 years ago
What’s five divided by 50
oksian1 [2.3K]
0.1 is your answer hope this helps
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3 years ago
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for every 1 book harry reads, Emily reads 3. the table shows the ratio 1:3 and two equivalent ratios. which graph shows the corr
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Answer:

(1,3) (2,6) (3,9) (4,12)

Step-by-step explanation:

Meanwhile the x value increases by 1, the y value increases by 3.

5 0
3 years ago
How? Just how I'm horrible at math​
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Answer:

<h3>c)</h3><h3>\frac{x + 2}{x - 3} . \frac{4}{x + 2}</h3>

3 0
4 years ago
Find the solution by graphing on the same grid:
alex41 [277]
              3x ≤ 5y - 10
       3x - 5y ≤ 5y - 5y - 10
3x - 3x - 5y ≤ -3x - 10
             -5y ≤ -3x - 10
              -5          -5
                y ≥ ³/₅x + 2

       2x - 4y < -6
2x - 2x - 4y < -2x - 6
             -4y < -2x - 6
              -4         -4
                y > ¹/₂x + 1¹/₂
3 0
3 years ago
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