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
bija089 [108]
3 years ago
12

A population has a mean of 300 and a standard deviation of 70. Suppose a sample of size 125 is selected and is used to estimate

. Use z-table. What is the probability that the sample mean will be within +/- 8 of the population mean (to 4 decimals)? (Round z value in intermediate calculations to 2 decimal places.) What is the probability that the sample mean will be within +/- 17 of the population mean (to 4 decimals)? (Round z value in intermediate calculations to 2 decimal places.)

Mathematics
1 answer:
Mrrafil [7]3 years ago
5 0

Answer:

a:  0.8884

b: 0.9934

Step-by-step explanation:

We have µ = 300 and σ = 70.  The sample size, n = 125.  

For the sample to be within 8 units of the population mean, we would have sample values of 292 and 308, so we want to find:

P(292 < x < 308).

We need to find the z-scores that correspond to these values using the given data.  See attached photo 1 for the calculation of these scores.

We have P(292 < x < 308) = 0.8884

Next we want the probability of the sample mean to be within 17 units of the population mean, so we want the values from 283 to 317.  We want to find

P(283 < x < 317)

We need to find the z-scores that correspond to these values.  See photo 2 for the calculation of these scores.

We have P(283 < x < 317) = 0.9934

You might be interested in
Someone please help!!
Katena32 [7]

After solving for both variables, you find that each bus can hold 59 students and each van can hold 18 students.

Step-by-step explanation:

You can find the amount of students each vehicle can carry by representing the two scenarios in equations.

You are trying to find how many students will fit in each bus or van, so the two variables used will be "b" to represent how many students can fit in a bus and "v" to represent how many students can fit in a van.

High school A used 1 van and 6 buses, so there will be 1"v" and 6"b" for 372 students.

High school B used 4 vans and 12 buses, so there will be 4"v" and 12"b" for 780 students.

Now, represent these in equations:

v+6b = 372\\4v + 12b = 780

We can use substitution to solve this system:

v + 6b = 372 can be rewritten as v = 372 - 6b after subtracting 6b from both sides. You can then substitute this new value of "v" into the other equation to solve for "b":

4(372-6b) + 12b = 780\\1488 - 24b + 12b = 780\\1488 - 12b = 780\\-12b = -708\\b = 59

After solving for b, you can then substitute the new value of b into the other equation to find the value of v:

v + 6(59) = 372\\v + 354 = 372\\v = 18

After solving for both variables, you find that each bus can hold 59 students and each van can hold 18 students.

5 0
3 years ago
Read 2 more answers
Help, please I need a mathswatch answer this is from the mathswatch website
torisob [31]

Answer:

158.76

Step-by-step explanation:

11.7*15.6=182.52

182.52/2=91.26

Area of BCD=91.26

7.5*18=135

135/2=67.5

Area of BAD=67.5

Altogether:

91.26+67.5=158.76

4 0
2 years ago
Enter the value of x.
dlinn [17]
10 is the answer because using the Pythagorean theorem 6^2 + 8^2 = 100. The square root of 100 would be 10
3 0
3 years ago
Read 2 more answers
Need need need need help help help help help help help help help
GenaCL600 [577]
.3 = 3/10
.5 = 1/2
.05 = 1/20
.25 = 1/4
4 0
3 years ago
Read 2 more answers
The coordinates of points A and B are A(4, -2) and B(12, 10). What are the coordinates of the point that is 1/4 of the way from
Vanyuwa [196]

Answer:

Step-by-step explanation:

(4 + 12)/4 = 16/4 = 4

(-2 + 10)/2= 8/4 = 2

(4, 2) is 1/4 of the way from A to B

3 0
3 years ago
Other questions:
  • What is 1578 divided 2
    14·2 answers
  • Math Homework Help
    13·1 answer
  • The current method of counting a country's population by requiring every household to complete a census form once every 10 years
    14·1 answer
  • Which expression is NOT equivalent to the other three?
    8·2 answers
  • Can someone please help..? My dad left to go get milk for 2.36, but then never came back. Where’d he go??
    11·2 answers
  • Tell answer
    10·1 answer
  • Kaley and tom both work at publix
    14·2 answers
  • A recent poll in your state shows that 25% of the vehicles are SUV’s and 10% are trucks. The pill counted 5 million SUV’s. How m
    11·1 answer
  • PLEASE HELP DUE NOW!!!<br> WILL MARK BRAINLIEST!!!
    12·2 answers
  • The cost of a service call to fix a washing machine can be expressed by the linear function y = 45 x + 35, where y represents th
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!