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
irina1246 [14]
3 years ago
6

Test scores for a standardized math test follow a normal distribution with a mean of 73 and a standard deviation of 8. a random

sample of 23 students took this math test. what is the probability that the average score of the 23 students falls above 75?
Mathematics
1 answer:
Sauron [17]3 years ago
6 0

Solution:

We are given:

μ=73,σ=8,n=8

We have to find P(Mean >75)

To find this probability, we need to find the z score:

z=(xbar-μ)/(σ/sqrt(n))

=(75-73)/(8/sqrt(23))

=1.20

Now we have to find P(z>1.20)

Using the standard normal table, we have:

P(z>1.20)=0.1151

Therefore the probability that the average score of the 23 students falls above 75 is 0.1151

You might be interested in
No body helped me the last time so I’m posting it again I really need help with this
PIT_PIT [208]
B is equal to 154 degrees. we know this cause half of the circle equals 180 and if you subtract a (26) from 180 you get 154
3 0
3 years ago
Write these equations in y=mx+b form....
nekit [7.7K]
1. y = -1/2 + 2.
2. y= 2/5x - 4/5

6 0
4 years ago
Please help I’m struggling
gulaghasi [49]

Answer: B, x=20; angle measure is 30°.

Step-by-step explanation:

Opposite angles are always the same.

You can see that 30° and 3x are opposite angles therefore 3x=30°.

In algebra, when a letter and a number are next to each other, it means times.

So, 3x=30° means 3 times something equals 30.

And we know that 3×10=30 so, x=10.

Hope this helps :)

3 0
3 years ago
Complete the following statements. In general, % of the values in a data set lie at or below the median. % of the values in a da
ELEN [110]

Answer:

Complete the following statements. In general, 50% of the values in a data set lie at or below the median. 75% of the values in a data set lie at or below the third quartile (Q3). If a sample consists of 500 test scores, of them 0.5*500 = 250 would be at or below the median. If a sample consists of 500 test scores, of them 0.75*500 = 375 would be at or above the first quartile (Q1).

Step-by-step explanation:

The median separates the upper half from the lower half of a set. So 50% of the values in a data set lie at or below the median, and 50% lie at or above the median.

The first quartile(Q1) separates the lower 25% from the upper 75% of a set. So 25% of the values in a data set lie at or below the first quartile, and 75% of the values in a data set lie at or above the first quartile.

The third quartile(Q3) separates the lower 75% from the upper 25% of a set. So 75% of the values in a data set lie at or below the third quartile, and 25% of the values in a data set lie at or the third quartile.

The answer is:

Complete the following statements. In general, 50% of the values in a data set lie at or below the median. 75% of the values in a data set lie at or below the third quartile (Q3). If a sample consists of 500 test scores, of them 0.5*500 = 250 would be at or below the median. If a sample consists of 500 test scores, of them 0.75*500 = 375 would be at or above the first quartile (Q1).

5 0
3 years ago
Reduce to the lowest terms by canceling -14/9 times -3/7
maksim [4K]

Answer:

2/3

Explanation:

Given the below;

\frac{-14}{9}\times\frac{(-3)}{7}

We can see from the above that 9 is divisible by 3 and that 14 is divisible by 7, let's go ahead and reduce to the lowest term as shown below;

\frac{-14}{9}\times\frac{(-3)}{7}=\frac{-2}{3}\times\frac{(-1)}{1}=\frac{2}{3}

5 0
1 year ago
Other questions:
  • 4 = 5x + 3y plz i need an answer for this
    8·2 answers
  • An SUV costs $25,535 and costs an average of $0.18 per mile to maintain. A hybrid model of the SUV costs $32,395 and costs an av
    14·1 answer
  • Find x, if 36, x, x, 16 are in proportion.<br><br>please tell fast​
    7·2 answers
  • Any one who needs help friend me okay?
    10·2 answers
  • PLZZZZZ HELP MEEEEEEEEEEEEEEE
    13·2 answers
  • I need help on how to solve this so anything is good :)
    6·1 answer
  • HELP ME PLEAS EILL GIVE BRAINLY!!!!!!
    13·2 answers
  • Please help me this is due in 10 minutes i’ll give brainlyist
    7·1 answer
  • Kurt opened a savings account and deposited $3,000.00 as principal. The account earns 5%
    11·1 answer
  • Exact value: 9mm<br> approx value: 11mm
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!