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
Grace [21]
3 years ago
11

Professor smith conducted a class exercise in which students ran a computer program to generate random samples from a population

that had a mean of 50 and a standard deviation of 9 mm. each of smith's students took a random sample of size n and calculated the sample mean. smith found that about 68% of the students had sample means between 48.5 and 51.5 mm. what was n? (assume that n is large enough that the central limit theorem is applicable.)
Mathematics
1 answer:
Advocard [28]3 years ago
4 0
When xbar is 48.5

-1 is (48.5 - 50)/(9/sqrt n)
-9/sqrt n is -1.5
n is (9/1.5²) is 36

when xbar is 51.5
+1 is (51.5 - 50)/(9/sqrt n)
9/sqrt n is1.5
n is (9/1.5)² is 36
You might be interested in
Write "495 miles in 9 hours" as a rate in simplest form.
iogann1982 [59]

Answer:

44.55

Step-by-step explanation:

9 percent of 495

3 0
3 years ago
Read 2 more answers
What is the prime factorization of 140? A 2^2×3×7 B. 2^3×7 C. 4×5×7 D. 2^2×5×7​
Andreyy89

Answer:

Step-by-step explanation:

7 0
2 years ago
If a student did not travel to a Spanish-speaking country, how many times more likely is it that the student did not take Spanis
olasank [31]

Answer:

It is 2.2 times as likely.

3 0
3 years ago
Find the missing angle.
Alina [70]

Answer:

sorry bro just wanted the points but thanks have a great day

Step-by-step explanation:

3 0
3 years ago
The harbormaster wants to place buoys where the river bottom is 20 feet below the surface of the water. Complete the absolute va
Natalija [7]

Answer:

The answer is below

Step-by-step explanation:

The bottom of a river makes a V-shape that can be modeled with the absolute value function, d(h) = ⅕ ⎜h − 240⎟ − 48, where d is the depth of the river bottom (in feet) and h is the horizontal distance to the left-hand shore (in feet). A ship risks running aground if the bottom of its keel (its lowest point under the water) reaches down to the river bottom. Suppose you are the harbormaster and you want to place buoys where the river bottom is 20 feet below the surface. Complete the absolute value equation to find the horizontal distance from the left shore at which the buoys should be placed

Answer:

To solve the problem, the depth of the water would be equated to the position of the river bottom.

d(h)=river \ bottom\\\\The \ river \ bottom=-20\ feet(below)\\\\d(h) = -20\\\\\frac{1}{5}|h-240|-48=-20\\ \\\frac{1}{5}|h-240|=-20+48\\\\\frac{1}{5}|h-240|=28\\\\|h-240|=28*5\\\\|h-240|=140\\\\h-240=140\ or\ h-240=-140\\\\h=140+240\ or\ h=-140+240\\\\h=380\ or\ h=100\\\\The\ buoys\ should\ be\ placed\ at\ 100\ feet\ and\ 380\ feet\ from\ left-hand\ shore

4 0
3 years ago
Other questions:
  • Simplify the expression tan(-x)csc(-x)/sec(-x)cot(-x)
    8·2 answers
  • PLEASE HELPPPP!!! ( I need two people to answer so I can give brainliest)
    6·1 answer
  • 1/4 x -2&gt;1<br><br> and the grater than sign has a line under it.
    11·1 answer
  • For this question you will need to analyze data given in file seed Emergence. For your convenience, the data is posted as a text
    12·1 answer
  • How do I know which operation to use with a word math problem
    10·1 answer
  • Help me on This I really need help
    13·1 answer
  • Find the height of a square pyramid that has a volume of 32 cubic feet and a base length of 4 feet. . . . a. 2 feet. b. 4 feet.
    7·1 answer
  • 2120
    9·2 answers
  • Pedro spins the pointer of a spinner 10 times. The pointer lands on the color blue 7 times. Write a fraction to represent the pa
    11·2 answers
  • Jacob received a deck of cards for his birthday. The length, width, and height of the card box are shown below. What is the volu
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!