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
Ket [755]
3 years ago
9

based on a survey of 32 randomly selected employees (anonymously, of course) the company has determined that the average amount

of time spent texting over a one-month period is 173 minutes with a standard deviation of 66 minutes. what is the probability that the average amount of time spent using text messages is more than 199 minutes
Mathematics
1 answer:
kramer3 years ago
6 0

Answer: 0.0129

Step-by-step explanation:

Given : Sample size : n=32

The average amount of time spent texting over a one-month period is  : \mu=173\text{ minutes}

Standard deviation : \sigma=66\text{ minutes}

We assume that the time spent texting over a one-month period is normally distributed.

z-score : z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}

For x=  199

z=\dfrac{199-173}{\dfrac{66}{\sqrt{32}}}\approx2.23

Now by using standard normal table, the probability that the average amount of time spent using text messages is more than 199 minutes will be :-

P(x>199)=P(z>2.23)=1-P(z\leq2.23)\\\\=1- 0.9871262=0.0128738\approx0.0129

Hence, the required probability = 0.0129

You might be interested in
What is the total number of 17 year olds whos height is 74 inches or less
stira [4]

Answer:

2

Step-by-step explanation:

there is 2 dots along the line of 17 before 74

hope this helps :)

6 0
3 years ago
5x-6y=-15 5x+6y=12 use elimination
Vlad [161]
<span>5x-6y=-15
5x+6y=12
---------------add
10x = -3
x = -3/10
x = -0.3

</span>5x+6y=12
5(-0.3) + 6y = 12
6y = 12 + 1.5
6y = 13.5
y = 13.5 / 6

y = 2.25
4 0
2 years ago
Sara has 16 red flowers and 24 yellow flowers. She wants to make a bouquet with the same number of each color flowers in each bo
Nimfa-mama [501]
Sara can make 8 bouquets, with 3 yellow flowers and 2 red ones in each bouquet. How pretty !
4 0
3 years ago
I will give brainliest! Which number has a 3 with a value that is 100 times greater than the values of the 3 in 20.342?
elena-s [515]

Answer:

36.25 and 307.18

Step-by-step explanation:

both are 100 times greater than 20.342.

7 0
3 years ago
Read 2 more answers
Subtract. –5.8 – (–8.4) A. –14.2 B. –2.6 C. 2.6 D. 14.2
svp [43]
-5.8 - (-8.4)

When we multiply two negatives they become a positive. In this situation, where there is no other number, you can assume there's basically a 1 in that place. 

-5.8 - 1(-8.4) would be just as correct. (If this helps visually clarify anything.)

So we take that -1 and multiply it by that -8.4. Multiplying 1 against anything leaves it the same, so we just need to change the sign. Two negatives make a positive. 

-5.8 + 8.4

Now we add these together.

This gives us our final answer of 2.6
6 0
3 years ago
Read 2 more answers
Other questions:
  • A ticket agency charges a 9.5% fee on all tickets sold. If a ticket costs $40, what is the fee? Please use either the percent pr
    8·2 answers
  • Which means the sum of w and 3.4 is greater than or equal to 10.5
    13·1 answer
  • Which function has an inverse that is a function?
    11·1 answer
  • Heyy, please find the answers to the two questions below in the attachment. Thanks!
    7·1 answer
  • Morgan rewrote the expression 90 + (10 + 4.8) as (90 + 10) + 4.8. How will this change the work that is needed to evaluate the e
    11·2 answers
  • Guys help me with numbers 3,4,5 please
    12·1 answer
  • (50 POINTS) Composite Functions MATH please help
    15·1 answer
  • Suppose 54% of the registered voters in a country are Democrats. If a sample of 770 voters is selected, what is the probability
    13·1 answer
  • 20 POINTS I could really use some help​
    13·1 answer
  • Solving two step inequalities
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!