1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Neko [114]
3 years ago
7

The time it takes to deliver a pizza (from time of phone call to delivery at door) follows a normal distribution with a mean (µ)

of 45 minutes and a standard deviation () of 5 minutes. If a pizza store’s policy is, "Orders delivered within one hour or they’re free!", what percentage of the store’s total delivery orders will be delivered to consumers with charge?
Mathematics
1 answer:
Yuki888 [10]3 years ago
5 0

Answer:

99.87% of the store’s total delivery orders will be delivered to consumers with charge

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 45, \sigma = 5

If a pizza store’s policy is, "Orders delivered within one hour or they’re free!", what percentage of the store’s total delivery orders will be delivered to consumers with charge?

Within one hour, which is 60 minutes. So this is the pvalue of Z when X = 60.

Z = \frac{X - \mu}{\sigma}

Z = \frac{60 - 45}{5}

Z = 3

Z = 3 has a pvalue of 0.9987

99.87% of the store’s total delivery orders will be delivered to consumers with charge

You might be interested in
HELP QUESTION NUMBER THREE
yKpoI14uk [10]

Answer:

(-3,2) is the solution to the system of equation

Step-by-step explanation:

Here, we want to know the point that serves as a solution to the system of equation

We equate the y

-2x + 4 = -1/3x-1

Multiply through by 3

-6x + 12 = -x-3

-6x + x = -3-12

5x = 15

x = 15/5

x = 3

Substitute x into one of the y

y = -2(3) + 4

y = -6 + 4 = -2

So the solution is;

(3,-2)

8 0
3 years ago
Is the following conditional true or false? If it is true, explain why. If it is false, give a counterexample. If it is snowing
zmey [24]
That is true because Dallas, Texas in IN the U.S.
So, it is snowing in the United States if it is snowing in Dallas Texas
3 0
3 years ago
Read 2 more answers
A large concrete mixing machine can mix a certain amount of concede in 12 hours, while a smallet one can mix
Andrews [41]

Answer:

[(1/12)(5/5) + (1/20)(3/3)](x hours) = 1

(5/60 + 3/60)x = 1

(8/60)x = 1 we can reduce 8/60 by dividing out a 4

(2/15)x = 1 x both sides by 15/2

x = 15/2

x = 7 1/2 or 7.5 hours

5 0
3 years ago
Can you help please ASAP
V125BC [204]

Answer:

Step-by-step explanation:

External angle equals to the sum of opposite internal angles

z - 41° + z - 20° = z + 40°

2z - 61° = z + 40°

2z - z - 61° = 40°

z - 61° = 40

z = 40° + 61°

z = 101°

5 0
3 years ago
Which is the best estimate of the correlation coefficient for the scatter plot?
leva [86]

The best estimate for this correlation would be B) 0.9.

We can see that the number is constantly going up, which would throw out the D answer.

We can also see that for every time the x goes up 1, the y goes up a little less than one. We can see that in the ordered pairs that exist on the graph such as (3, 2), (8, 6) and (2.1, 1.9).

Since the y values are just lower than the x, the correlation would be just under one. Therefore, 0.9 is an accurate estimation.

7 0
3 years ago
Read 2 more answers
Other questions:
  • There are 156, 208 and 260 students in
    7·1 answer
  • You buy a dress that was originally $140 but it is marked down 35% the door buster deal earns your extra 15% off you are assesse
    5·1 answer
  • Compare 6,200.ft by 1.mi 900.ft
    10·2 answers
  • Suppose potato chips cost 36.5
    10·1 answer
  • Find the slope of the line that contains the points (-2, 5) and (-1, 7).
    5·1 answer
  • Lana earns $7.95 per hour . How much does she earn in 8 ?
    11·2 answers
  • Which subset of the rational numbers best describes the number of students that could be in a classroom?
    15·1 answer
  • In a regular polygon with n sides, what is the smallest angle of rotation about the center for which the polygon will be napped
    12·1 answer
  • Use the graph to the right to write an equation of the line​
    5·1 answer
  • Rewrite 5/6 and 6/7 so they have a common denominator
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!