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Arte-miy333 [17]
3 years ago
9

John runs a computer software store. Yesterday he counted 125 people who walked by the store, 66 of whom came into the store. Of

the 66, only 21 bought something in the store. (Round your answers to two decimal places.)
(a) Estimate the probability that a person who walks by the store will enter the store.


(b) Estimate the probability that a person who walks into the store will buy something.



(d) Estimate the probability that a person who comes into the store will buy nothing.
Mathematics
1 answer:
Scrat [10]3 years ago
3 0

A. Divide number of people in the shop by total people walking by:

66/125 = 0.528 = 0.53

B. Divide people who bought something by total people walking by:

21/125 = 0.168 = 0.17


d. 66 -21 = 45 people don’t buy anything.

45/66 = 0.68

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Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. what is the probabi
olasank [31]
To solve for the P(54,000≤x≤66000) we proceed as follows:
z-score=(x-μ)/σ
μ-60000
σ-4000
thus:
when x=66,000
z-score=(66000-60000)/4000=1.5
P(z≤1.5)=0.9332
when x=54000
z=(54000-60000)/4000
z=-1.5
P(z≤-1.5)=0.0668
thus
 P(54,000≤x≤66000) 
=P(z≤1.5)-P(z≤-1.5)
=0.9332-0.0668
=0.8664

Answer: 0.8664
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Which proportion could be used to solve
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Answer:

Cups of carrot needed for 9 servings = 4.5 cups

Step-by-step explanation:

A recipe for sesame chicken calls for cup of chopped carrots

recipe 2 is for 4 servings

That is

2 cups of carrot = 4 servings

2 : 4

= 1 : 2

1 cup of carrot = 2 servings

how many cups of

carrots are needed for 9 servings?

Let x= number of carrot needed for 9 servings

1 : 2 = x : 9

1 /2 = x/ 9

Cross product

1*9 = 2*x

9=2x

Divide both sides by 2

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6 0
3 years ago
Write the ratio as a fraction in simplest form.<br><br> 10.8 seconds : 36 feet <br><br> (Show work)
vodka [1.7K]

Answer: Ratio as a fraction in simplest form is :

\frac{27}{1}=27

Step-by-step explanation:

Since we have given that

10.8 seconds : 36 feet

As we know that

1\ second=\frac{1}{60}\ mile\\\\1\ second=90\ feet

So, we use it :

10.8 seconds : 36 feet

=10.8\times 90\ feet:36\ feet\\\\=972:36\\\\=27:1

Hence, Ratio as a fraction in simplest form is :

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