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
sattari [20]
3 years ago
11

Diane's Tree Trimming Service has trimmed hundreds of trees in the Greater Denver area. The time it takes to trim a tree is norm

ally distributed with a mean of 32 minutes and a standard deviation of 5 minutes (Use this distribution to answer the next several questions). What percent of trees get trimmed between 28.5 and 31.5 minutes? Group of answer choices 21.82% 75.80% 70.22% 29.78%
Mathematics
1 answer:
kkurt [141]3 years ago
8 0

Answer:P(28.5And we can find this probability with this difference:

P(-0.7

And in order to find these probabilities we use tables for the normal standard distribution, excel or a calculator.

P(-0.7

So then the best answer would be 21.82 %

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the time it takes to trim a tree of a population, and for this case we know the distribution for X is given by:

X \sim N(32,5)  

Where \mu=32 and \sigma=5

We are interested on this probability

P(28.5

And the best way to solve this problem is using the normal standard distribution and the z score given by:

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

If we apply this formula to our probability we got this:P(28.5And we can find this probability with this difference:

P(-0.7

And in order to find these probabilities we use tables for the normal standard distribution, excel or a calculator.

P(-0.7

 So then the best answer would be 21.82 %

You might be interested in
What is the colon form? :)​
Ann [662]

Answer and Step-by-step explanation:

I think this is correct? The directions aren't very clear/descriptive, so sorry if this is wrong.

A.

1. wins:games

2. wins:losses

3. losses:wins

4. games played:wins

5. losses:games played

B.

1. 8:12, or 2:3

2. 3:7

3. 5:3

4. 12:15, or 4:5

5. 20:25, or 4:5

<em><u>#teamtrees #PAW (Plant And Water)</u></em>

4 0
2 years ago
What is 8×8-9+6-8+8+9
erica [24]

From what i can see, the answer is 70

6 0
3 years ago
Read 2 more answers
A lotion is made from an oil blend costing $1.50 per ounce and glycerin costing $1.00 per ounce. Four ounces of lotion costs $5.
Svet_ta [14]

Answer:

A (4-g)1.5

Step-by-step explanation:

hope this helps if you need a explanation just ask in the comments and I will.

8 0
2 years ago
1 - ½ = ____ whats the answer pls
Pavlova-9 [17]
1/2 or 0.5
2/2 which is 1 - 1/2
6 0
2 years ago
3/5 is 30% of what number?
Daniel [21]
3/5 of what number =15
5 0
3 years ago
Other questions:
  • A pillow that usually costs $18 is marked down 25%. Which expressions can be used to find the new price of the pillow?
    13·2 answers
  • A container is shaped like a rectangular prism and has a volume of 72 cubic feet. Give four different sets of measurements that
    6·1 answer
  • An experiment involves 31 participants. From these, a group of 5 participants is to be tested under a special condition. How man
    15·1 answer
  • Suppose that F(x) = x2 and G(x) = -1/3(x+4)2. Which statement best compares the graph of G(x) with the graph of F(x)
    10·1 answer
  • Need help! Merry Christmas!
    5·2 answers
  • Solve system of equation by elimination:
    15·2 answers
  • What is 2 ( 3x+5) - 2( x+ 4)
    15·2 answers
  • I need help ASAP!!!!
    14·2 answers
  • What are two different ways 2/3x=10 could be solved for x
    6·1 answer
  • Will give brainliest!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!