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
labwork [276]
1 year ago
9

The mean score on an exam was 77.7 and the standard deviation was 12.1Find the probability that a person scored above 90 on this

exam.
Mathematics
1 answer:
Darya [45]1 year ago
8 0

Step by step explanation

Lets first find the z-score for 90 in this normal distribution:

z=\frac{90-77.7}{12.1}\approx1.0165

Reviewing the table, for this value we have:

P(x>90)=0.1547

Answer

The probability that a person scored above 90 is 0.1547, that is 15.47%

You might be interested in
The length of the line segment <br><br> AB equals 3x+1<br><br> BC equals 4x-5<br><br> AC equals 8x-9
yanalaym [24]

Answer:

X = 5

Step-by-step explanation:

Here is what I am picturing (not to scale)

A ----------------B-----------C

We are given the information of AB (which equals 3x + 1), BC (which equals 4x - 5), and AC (which equals 8x - 9).

With reference to the line, AB + BC = AC

So,

3x + 1 + 4x - 5 = 8x - 9

7x - 4 = 8x - 9

5 = x

4 0
3 years ago
which of the following is the result of using the remainder theorem to find F(-1) for the polynomial function F(x) = -x^3+6x^2-4
balandron [24]

Answer:

d). 22

Step-by-step explanation:

add the -1 for x then solve

7 0
3 years ago
This week laptops are 25% off. If a laptop cost $340 what is it's sale price?
Andrej [43]
The sale price is $255
7 0
4 years ago
Read 2 more answers
Factor out the gcf<br><br> -240c^2+ 30c^5+ 18c^4
exis [7]

Answer:

6c^2(-40 + 5c^3 + 3c^2)

Step-by-step explanation:

These three terms have the common factor c^2.  Thus:

-240c^2+ 30c^5+ 18c^4 = c^2(-240+ 30c^3+ 18c^2).

Recognizing that 6 is common to all three terms inside the parentheses, we get:

6c^2(-40 + 5c^3 + 3c^2)  This is as far as factoring of this expression can be taken.

8 0
3 years ago
1. You are planning to hang lights around your windows for a party. The cost is
torisob [31]

Answer:

need more info to help

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • There are 144 people in line. There are twice as many adults as children in line .How many children in line and how many adults
    15·1 answer
  • How many total blocks will she travel if she goes to Amanda‘s house and then to Karen’s and finally back home
    11·1 answer
  • Write 24,850,120 in expanded form
    11·1 answer
  • Complete.
    9·1 answer
  • What is the area of pentagon ABCDE ?
    10·1 answer
  • Date
    11·2 answers
  • To run a mile, Jamal must run 4 laps around the track. His goal is to run 3 miles. Jamal has run 9 laps so far.
    10·2 answers
  • What is the conjugate of 7+2√5<br><br><br> i don’t know how to do this please help
    6·1 answer
  • I will add you to brainlist if you get the answer right promise ​
    13·1 answer
  • How much money will be in a bank account after 3 years if $9 is deposited at an interest rate of 5% compounded annually? Round t
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!