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]
3 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]3 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 the unit rate of 360 miles travled on 12 gallons of gasoline
svetlana [45]
30 miles/ 1 gallon
30 miles per gallon
30/1
8 0
3 years ago
On a coordinate plane, 2 lines are shown. Line A B has points (negative 4, negative 2) and (4, 4). Line C D has points (0, negat
klasskru [66]

Answer:

Option A) They are parallel because their slopes are equal.

Step-by-step explanation:

We are given the following in the question:

Line AB:

(-4, -2), (4,4)

Line CD:

(0,-3), (4,0)

Formula to calculate slope =

(x_1, y_1), (x_2, y_2)\\\\\\text{Slope} = m = \dfrac{y_2 - y_1}{x_2 - x_1}

Slope of AB =

(-4, -2), (4,4)\\\\m_{AB} = \dfrac{4-(-2)}{4-(-4)} = \dfrac{6}{8} = \dfrac{3}{4}

Slope of CD =

(0,-3), (4,0)\\\\m_{CD} = \dfrac{0-(-3)}{4-0} = \dfrac{3}{4}

Thus,

m_{AB} = m_{CD}

Thus, the two lines are parallel.

Option A) They are parallel because their slopes are equal.

3 0
3 years ago
Read 2 more answers
jen rode her bike 1/5 of a mile to her friends house. it took her 5 minutes to get there. what was Jen's speed.
zzz [600]

Answer:

2.4 mph

Step-by-step explanation:

Can you mark me as brainliest

6 0
3 years ago
Help me and fast please
iogann1982 [59]

Answer: the answer is C

Step-by-step explanation: we know this because a straight line is 180 degrees.  So given 140 degrees we know that g= 40.

8 0
3 years ago
A particular strain of a common bacteria replicates itself every 14 minutes. Which of the following does this situation represen
Pepsi [2]

Answer:

D-both a relation and a function

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • Circle J is congruent to circle P. Circles J and P are congruent. Chords O K and Q R are congruent and chords K M and R T are co
    11·2 answers
  • What is the average of 55 64 60 and 61
    13·2 answers
  • 80000 times 60 plus 89
    7·1 answer
  • What is an exponent?
    8·2 answers
  • A psychologist developed a new test of adult intelligence. The test was administered to 20 individuals, and the following data w
    10·1 answer
  • Ab-.5b when a= 1 and b= 5
    13·1 answer
  • 6k ÷ 7 = -3<br> Solve for k
    7·1 answer
  • DC= 10 what is the value of AD
    11·1 answer
  • Consider the following equation. Graph 5x + 6y = 30<br> PLEASE SHOW STEPS
    13·1 answer
  • design a statistical process for finding how satisfied the students are in the cafeteria of the school with the quality of food
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!