![marcos86](/avatars/13222.jpg)
marcos86
26.08.2020 •
Mathematics
On the graph at left, row 1 shows the discriminant (D)
for the quadratic function.
Right now D=12.
On the next screen, you'll be able to change a, b, and
c. Before you do, make a prediction.
Which of these values can you change to make D
larger? How can you change that value?
Solved
Show answers
More tips
- H Health and Medicine Simple and Effective: How to Get Rid of Cracked Heels...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
- A Art and Culture When Will Eurovision 2011 Take Place?...
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
- F Family and Home Why Having Pets at Home is Good for Your Health...
- H Health and Medicine How to perform artificial respiration?...
- H Health and Medicine 10 Tips for Avoiding Vitamin Deficiency...
- F Food and Cooking How to Properly Cook Buckwheat?...
Answers on questions: Mathematics
- M Mathematics The time married men with children spend on child care averages 5.9 hours per week (Time, March 12, 2012). You belong to a professional group on family practices that...
- M Mathematics What is the area of a triangle...
- M Mathematics LEIce Cream Incredibly delicious treatComes in a variety of flavorsEveryone loves itColorful sprinkles on topReady for it anytimeExcellent on a hot dayAll types of toppingsMelts...
- M Mathematics Can anybody help me with the question please...
- M Mathematics Find the missing length to the nearest tenth. 11.2 6.6...
- M Mathematics Group Project A knitting machine can produce 1,000 pairs of pants or 3,000 shirts (or a combination of the s each day. The finishing department can handle either 1,500...
- M Mathematics Lauren simplified the expression as shown (m-) = m+7+(-5) = m+12 - 1 m12 Which statement explains Lauren s error?...
- M Mathematics claim: the mean pulse rate (in beats per minute) of adult males is equal to 69 bpm. for a random sample of 140 adult males, the mean pulse rate is 70.4 bpm and the standard...
- M Mathematics Please help me solve Logx-3logx=2base6...
- M Mathematics First, read a draft of an essay, Two Critiques of Imperialism. This essay was writtenin response to an assignment asking the writer to examine how Joseph Conrad sHeart...
Ответ:
b. [278.90, 288.55]
See the explanation below.
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 amounts of energy of a population, and for this case we know the distribution for X is given by:
Where
and ![\sigma=9.1](/tpl/images/0507/5696/2dc4e.png)
LOWER LIMIT
For this part we want to find a value a, such that we satisfy this condition:
Both conditions are equivalent on this case. We can use the z score again in order to find the value a.
As we can see on the figure attached the z value that satisfy the condition with 0.25 of the area on the left and 0.75 of the area on the right it's z=-0.674. On this case P(Z<-0.674)=0.25 and P(z>-0.674)=0.75
If we use condition (b) from previous we have this:
But we know which value of z satisfy the previous equation so then we can do this:
And if we solve for a we got
So the value of height that separates the bottom 25% of data from the top 75% is 278.90.
UPPER LIMIT
For this part we want to find a value a, such that we satisfy this condition:
Both conditions are equivalent on this case. We can use the z score again in order to find the value a.
As we can see on the figure attached the z value that satisfy the condition with 0.7 of the area on the left and 0.3 of the area on the right it's z=0.524. On this case P(Z<0.524)=0.7 and P(z>0.524)=0.3
If we use condition (b) from previous we have this:
But we know which value of z satisfy the previous equation so then we can do this:
And if we solve for a we got
So the value of height that separates the bottom 70% of data from the top 30% is 289.78.
With the procedure we got for the limits [278.9 , 289.78]
And since any of the options are on the list we take th most similar for this case:
b. [278.90, 288.55]