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
irakobra [83]
3 years ago
5

normal population has a mean of 63 and a standard deviation of 13. You select a random sample of 25. Compute the probability tha

t the sample mean is: (Round your z values to 2 decimal places and final answers to 4 decimal places): Greater than 65.
Mathematics
1 answer:
alexira [117]3 years ago
4 0

Answer:

0.2207

Step-by-step explanation:

Here, we want to find the probability that the sample mean is greater than 25.

What we use here is the z-scores statistic

Mathematically;

z-score = (x-mean)/SD/√n

From the question;

x = 65, mean = 63, SD = 13 and n = 25

Plugging these values in the z-score equation, we have

Z-score = (65-63)/13/√25 = 2/13/5 = 0.77

So the probability we want to calculate is ;

P(z > 0.77)

This can be obtained from the standard normal distribution table

Thus;

P(z > 0.77) = 0.22065 which is 0.2207 to 4 d.p

You might be interested in
Question in the photo
Elena-2011 [213]
The answer would be: 13^3.

This is because 2-4= -2
Then you add -2 to 5 and you would get 3. So the exponent is 3.
I hope this helps :)
4 0
3 years ago
What is a square root of a number
icang [17]
Finding the square root of a number is the inverse operation of squaring that number. Remember, the square of a number is thatnumber times itself. The perfect squares are the squares of the wholenumbers. The square root of a number, n, written below is the number that gives n when multiplied by itself.
3 0
3 years ago
I need explanation and answer please,thanks.
Alla [95]
What’s the question?
3 0
3 years ago
PLEASE HELP<br><br> What is the value of x?
KonstantinChe [14]
Side JL is 4√2  recall that in a 30-60-90 right triangle the hypotenuse is 2 times the size of the short leg.

JL also serves as the hypotenuse of the 45-45-90 triangle JML.  The ratio of side lengths in this triangle is 1:1:√2

So we can see that the value of x = 4

7 0
3 years ago
It takes William 45 minutes to weed the garden. It takes his younger sister May 75 minutes to do the same job. If they work toge
marshall27 [118]

Answer:

B. 28 minutes

Step-by-step explanation:

According to the given statement,

William weeds the whole garden in 45 minutes, then in one minute he will weed 1/45 of the garden

and

similarly, 1/75 of the garden in one minute.

When they both will work together, they will weed (1/45+1/75) of the garden in one minute

Solving the equation:

= \frac{1}{45}+ \frac{1}{75}\\= \frac{75+45}{3375}\\ =\frac{120}{3375}\\ = 0.036

Garden weeded in one minute by both = 0.036

So, number of minutes to weed whole garden = 1/0.036

= 27.77 minutes

Rounding off will give us: 28 minutes

So,

Option B is the correct answer ..

4 0
3 years ago
Other questions:
  • What is 2ab when a=7 and b=2
    6·2 answers
  • (06.01)A spinner is divided into sections of equal size, of which some are red, some are blue, and the remaining are green. The
    11·2 answers
  • What is n? m=5n - 3 m=3n + 7
    5·1 answer
  • Is 25 x 10 to the power of 0 in scientific​ notation? If​ not, explain. Use pencil and paper. Explain why 10 is used as the base
    15·1 answer
  • Ishaan is 2 times as old as Christopher. 35 years ago Ishaan was 7 times as old as Christopher. How old is ishaan now?
    5·2 answers
  • What numbers are divisible by 3
    11·2 answers
  • Why you find 39 when you estimate difference 206and 167<br> Thinks
    15·1 answer
  • Determine which ordered pair is a solution of y = x to the power of 2, minus 2. Choices: (5,21), (-5, 24), (-1, -1), (-2, 6)
    9·2 answers
  • -6(10t – 5.1)<br> Please help me!!!
    8·1 answer
  • 4) EASY POINTS WILL GIVE BRAINLIST TO BEST ANSWER
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!