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
V125BC [204]
2 years ago
15

The scores on a test are normally distributed with a mean of 78 and a standard deviation of 13. Find the score that is 2 standar

d deviations below the mean
Mathematics
1 answer:
Veronika [31]2 years ago
4 0

Answer:

52

Step-by-step explanation:

Given that :

Mean (m) = 78

Standard deviation (s) = 13

Score that is 2 standard deviations below the mean

Using the relation :

Zscore = (x - m) / s

2 standard deviations below the mean means a Zscore of - 2

Hence,

-2 = (x - 78) / 13

Cross multiply

-2 * 13 = x - 78

-26 = x - 78

x = - 26 + 78

x = 52

Score which is 2 standard deviations below the mean is 52

You might be interested in
What is four sevenths of 35?
AnnZ [28]

The answer is 20. just multiply, 4/7*35=20.
5 0
3 years ago
Read 2 more answers
John and alisha randomly met at the local movie theater. what will affect their first impression of each other?
Vesna [10]
How they dress, What movie they buy, and what snacks you buy
7 0
3 years ago
Tanh(2a)==1/2 then a=?​
stepladder [879]

Answer:

2a=1/2

a=1/4

Step-by-step explanation:

6 0
2 years ago
Suppose that prices of recently sold homes in one neighborhood have a mean of $265,000 with a standard deviation of $9300. Using
Hatshy [7]

Answer:

Range  = (237100, 292900)

Step-by-step explanation:

Using Chebyshevs Inequality:

P(|X - \mu | \le k \sigma )\ge 1  -\dfrac{1}{k^2}= 0.889

1  -\dfrac{1}{k^2}= 0.889

\dfrac{1}{k^2}= 1- 0.889

\dfrac{1}{k^2}=0.111

k = \sqrt{\dfrac{1}{0.111}}

k \simeq 3

Thus, 88.9% of the population is within 3 standard deviation of the mean with the Range = μ  ±  kσ

where;

μ = 265000

σ = 9300

Range = 265000  ±  3(9300)

Range = 265000  ± 27900

Range =   (265000 - 27900, 265000 + 27900)

Range  = (237100, 292900)

3 0
2 years ago
What is 9,846,000,000,000 expressed in scientific notation?
AysviL [449]

Answer:

9.846 × 10¹²

Step-by-step explanation:

You didn't give the powers but that is the answer

5 0
3 years ago
Read 2 more answers
Other questions:
  • The sum of 40 consecutive integers is 100. what is the smallest of these 40 integers
    8·1 answer
  • Simplify.
    8·1 answer
  • write an inequality to represent the amount you need to spend to get a free greeting card.Then graph the soultion on the number
    14·2 answers
  • Simplify the follow<br>15- (8+3)​
    6·2 answers
  • If 5 candy bars cost $3.00, how much will 2 candy bars cost?
    7·1 answer
  • HELP ASAP FIRST CORRECT ANSWER GETS BRIANLEST. <br><br>solve for the angle C. A=110° B=×° C=(×+10)​
    7·1 answer
  • a customer is owed $30.00. how many different combinations of bills,using only five, ten, and twenty dollars bills are possible
    14·1 answer
  • The lengths of the parallel sides of
    8·1 answer
  • Geometry, please help!!!!!
    11·1 answer
  • Which algebraic expression represents this phrase?The product of 16 and the time after the star
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!