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
Finger [1]
1 year ago
8

Assume a normal distribution and that the average phone call in a certain town lasted 4 min, with a standard deviation of 1 min.

What percentage of the calls lasted lessthan 3 min?
Mathematics
1 answer:
olya-2409 [2.1K]1 year ago
4 0

SOLUTION

The mean is 4min

standard deviation is 1min

the z score is

z=\frac{x-\bar{x}}{\sigma}

where

\begin{gathered} x=3 \\ \bar{x}=4 \\ \sigma=1 \end{gathered}

then we have

\begin{gathered} z=\frac{3-4}{1}=\frac{-1}{1}=-1 \\ z=-1 \end{gathered}

The probability the call lasted less than 3 min will be

Therefore, the probability that (z < -1 ) is

[tex]\begin{gathered} Pr(z<-1)=Pr(0Hence, the percentage of the calls that lasted less than 3 min is 16%

You might be interested in
Help <br> Brainleist<br> 15 points
geniusboy [140]
Z=22
180-120=60
2x+16=60
2x=44
Z=22
7 0
2 years ago
Read 2 more answers
Circle theorem <br> This is a very easy question but i just can't seem to be able to answer it
xxMikexx [17]

The measure of <FCD is 77 degrees

<h3>Circle geometry</h3>

From the given diagram, we have the following:

m<FCD + 90 + m<F = 180 degrees

Given the following parameters

m<BEO = 13 degrees = m<F

Substitute into the formula:

m<FCD + 90 +13 = 180 degrees

m<FCD = 180 - 103

m<FCD = 77 degrees

Hence the measure of <FCD is 77 degrees

Learn more on circle geometry here; brainly.com/question/24375372

5 0
2 years ago
Please help I’ll give brainlyist
lakkis [162]

Answer:

The second choice

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Who wants to play rocket league with me<br><br>I'm gold3 so sry​
maw [93]

Answer:

Bet

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
A study is designed to examine the effect of doing synchronized movements (such as marching in step or doing synchronized dance
Vlada [557]

Answer:

The complete question in the graphic

A.

After synchronized exercise, it was observed that the average proximity rate has increased, which shows that the mean of the variable is positive and there is high synchronization in the groups.

.

B.

If groups with low synchronization and high effort are compared, the result of the average will be positive, so the average proximity rate will also increase after the synchronization exercise is performed.

On the contrary, if we observe the groups that have low synchronization and low effort, the mean of the variable is negative, thus the average proximity rate after performing the exercise will decrease.

(C)

considering that the total degrees of freedom is 259, it will show 260 students in the analysis.

D.

With a significance level of 5% or 0.05, the P value is less than the significance level, which leads to differentiating the mean of the scores before and after performing the combinations.

E.

With a significance level of 1% or 0.01, the p-value is higher than the significance level. With this data we can conclude that there is no difference between the results before and after the synchronized exercise

3 0
3 years ago
Other questions:
  • Four bottles of powerade cost $3.88. Find the unit price of each bottle
    14·2 answers
  • Solve 3x - x + 2 = 12
    15·1 answer
  • PLZ HELP!!!!!! (WILL GIVE BRAINLIEST!!!!)
    15·2 answers
  • Kira made $391 for 17 hours of work. At the same rate, how many hours would she have to work to make $184 ?
    8·2 answers
  • A<br> 1<br> 3<br> -2<br> -1<br> 0<br> B<br> -1<br> The midpoint of AB = ([?], [ ])
    12·1 answer
  • Amaya used these steps to solve the equation 8x+4 = 9+4(2x-1). Which choice describes the meaning of her result, 4 = 5?
    6·1 answer
  • Can someone please help with this?
    15·2 answers
  • Can u help me please
    15·2 answers
  • If £2000 is placed into a bank account that pays 3% compound interest per year, how much will be in the account after 2 years?
    14·2 answers
  • A cylinder has a surface area of 1,890 m^2 and a radius of 9 cm what is the volume of the cylinder to the whole number
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!