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
Sav [38]
3 years ago
15

The mean number of points in 1977 was 1189 points with standard deviation of 397 points. With a roughly normal distribution, wha

t percent of performances would fall between 395 and 1983 points?
Your answer
A. 100%
B. 68%
C. 95%
D.99.7%
Mathematics
1 answer:
KonstantinChe [14]3 years ago
5 0

Answer:

C. 95%

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean of 1189 points, standard deviation of 397 points.

Percentage between 395 and 1983 points?

395 = 1189 - 2*397

1983 = 1189 + 2*397

So within 2 standard deviations of the mean, which by the Empirical Rule is approximately 95%, and the answer is option C.

You might be interested in
Complete the definition of the piecewise defined
Westkost [7]

Answer: a=1 b=3

Step-by-step explanation: the x for each of the points are 1 and 3

7 0
2 years ago
9. Convert 10,000 seconds into<br> hours
arlik [135]

Answer: 2.7777 hours

Step-by-step explanation: Here, we're asked to convert 10,000 seconds into hours.

Unfortunately, we don't have a conversion factor for seconds and hours. However, we know that 60 seconds = 1 minute and 60 minutes = 1 hour.

So we can convert 10,000 seconds into hours by using both of these conversion factors. Also, it's important to understand that when we go from a smaller unit, seconds, to a larger unit, hours, we divide.

So let's first convert 10,000 seconds into minutes by dividing 10,000 by the conversion factor, 60, to get 166.6666 minutes.

Next, we convert minutes to hours by dividing 166.6666 by the conversion factor, 60, to get 2.7777 hours.

So 10,000 seconds is approximately equal to 2.7777 hours.

8 0
3 years ago
12 The cost of a telephone call is $0.60 for the first three minutes plus $0.17 for each additional minute. What is the greatest
rusak2 [61]
The correct answer would be j (18) because all you have to do is keep adding 0.17 and keep counting until you get to the 2.50 mark. I hope I helped you
8 0
3 years ago
Read 2 more answers
(2x³)⁴= ? What is the right answer, with full explanation please:
netineya [11]
So you multiply the 4th power

2 times 4 is 8
4 times 3 is 12
Then you plug it In 8x^12

So your answer is D

Hope this helps *smiles*
7 0
3 years ago
Read 2 more answers
What is the area of the shaded region?​
IRINA_888 [86]
20 because of the whole is 40 and the shaded part is by 20 you just take half of 40 and you get 20
3 0
3 years ago
Other questions:
  • It is known that x=7 is a root of the equation ax^2 + bx + 2= 0, where a&lt;0. Solve the inequality ax²4 +bx^2 + 2&gt;0.
    11·1 answer
  • An irregular parallelogram rotates 360° about the midpoint of its diagonal. How many times does the image of the parallelogram c
    15·1 answer
  • 7. Over the past 50 years, the number of hurricanes that have been reported are as follows: 9 times there were 6 hurricanes, 13
    12·1 answer
  • Select the postulate of equality or inequality that is illustrated.
    14·2 answers
  • Write two different expressions to represent the number that results<br> when x is increased by 40%.
    8·1 answer
  • 30 people want soda, how many 2 liter bottles do you you need so everyone but you have 300 ml glass's of soda?
    14·1 answer
  • please help! i had to retake this and i apparently got. few wrong and i don’t what i did so i have a couple questions that might
    7·1 answer
  • a pizza parlor has 8 different toppings and 3 different cheeses to choose from on the menu. how many pizza combinations are poss
    6·1 answer
  • Ben uses a compass and a straightedge to construct ∠DEF ≅ ∠ABC, as shown below:
    9·1 answer
  • What is the volume of the cylinder?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!