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
riadik2000 [5.3K]
3 years ago
5

A normal population has a mean of 12.2 and a standard deviation of 2.5. compute the z value associated with 14.3. what proportio

n of the population is between 12.2 and 14.3? what proportion of the population is less than 10.0?
Mathematics
1 answer:
Citrus2011 [14]3 years ago
5 0
The z-score associated with 14.3 is 0.84.  0.2995 of the population is between 12.2 and 14.3.  0.1894 of the population is less than 10.0.

The formula for a z-score is

z=(X-μ)/σ

With our data, we have:
z=(14.3-12.2)/2.5=0.84

The z-score associated with the mean is 0.5.  To find the proportion of the population between the mean and 14.3, subtract 0.7995 (the proportion of population below the z-score of 0.84, using http://www.z-table.com) and 0.5:

0.7995 - 0.5 = 0.2995.

The z-score for 10.0 is

(10.0-12.2)/2.5 = -0.88.  The proportion of the population less than this is 0.1894.
You might be interested in
A compound event in which the outcome of one event is affected by the outcome of another event is considered _________ events.
expeople1 [14]

Answer: dependent events

Step-by-step explanation:

Dependent events are refered to as the events that occur when occurrence of one of the events has an effect on the chances of the other event occuring as well.

For a dependent event, we should note that the outcome of the second event affects the dependent event. In a case when it doesn't affect each other, it's called independent event.

3 0
3 years ago
Need help please...answer correctly ​
Lelechka [254]

Answer:

9.09

Step-by-step explanation:

x=speed of boat

y=speed of water current

Downstream relative speed = x+y

Upstream relative speed = x-y

Distance remains the same for both upstream and downstream.

a) Distance travelled downstream = speed x time = 3(x+y)

Distance travelled upstream = speed x time = 3.6(x-y)

b) Since both distances are equal, we can write

3(x+y)= 3.6(x-y)

3x+3y = 3.6x-3.6y

6.6y = 0,6x

x=11y: y=x/11

c) Water current has speed as 1/11 times of that of boat

In percent this equals 100/11 = 9.09%

3 0
3 years ago
Read 2 more answers
jessie worked four more hours than Ben. They worked a total of 25 hours. How many hours did each boy workz?
Mandarinka [93]

Answer:

jessie: 14.5

ben: 10.5

3 0
3 years ago
Please help and I'll love you foreverrrrr no joke!!!
spin [16.1K]
Only like sedans: 25- 15 = 10

Only like hatchbacks: 40-15 = 25

Like both: 15

Like none of them: 100-10-25-15 = 50

Dislike sedans: 100 - 10-15 = 75

Dislike hatchbacks: 100-25-15 = 60

So dislikes: sedans>hatchbacks
4 0
3 years ago
Find the slope of the line that passes through (-6,1) and (4,-3)
Aleonysh [2.5K]
Slope\ formula=\frac{rise}{run}=\frac{y_2-y_1}{x_2-x_1}=\\\\\frac{-3-1}{4-(-6)}=\\\\\frac{-4}{10}=\\\\{\boxed{Slope=-\frac{2}{5}}
7 0
3 years ago
Other questions:
  • Find the value of x. <br><br> 13,15,17,x,20,21; The median is 18.
    12·1 answer
  • Simplify. (½) ²− 6(2−2/3)
    14·1 answer
  • To find the area under the standard normal distribution curve between two z values, one first finds the difference between the t
    6·1 answer
  • Help with 10-14 questions plz
    9·1 answer
  • In a certain town 60% of the households own mutual funds, 40% own individual stocks, and 20% own both mutual funds and individua
    15·1 answer
  • Jessica is selling books during the summer, can someone help out
    9·1 answer
  • There are two cube-shaped tanks. One of the tank has a 3 m side, while the other one has a side measuring half of the first one.
    5·1 answer
  • Compare and contrast the words malfunction and dysfunction
    12·1 answer
  • Identify the area of the kite
    11·2 answers
  • Q: The central angle of sector E is 71 degrees and the central angle of sector F is 39 degrees. What is the probability that the
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!