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
Elena-2011 [213]
3 years ago
11

A simple random sample of 5 observations from a population containing 400 elements was taken, and the following values were obta

ined (12 18 19 20 21). A point estimate of the mean is?
Mathematics
1 answer:
Strike441 [17]3 years ago
3 0

Answer:  18

Step-by-step explanation:

  • The<u> sample mean</u> is the best point estimate of the population mean .

Given : A simple random sample of 5 observations from a population containing 400 elements was taken, and the following values were obtained (12 18 19 20 21).

Then , the sample mean = \dfrac{\text{Sum of observations}}{\text{Number of observations}}

sample mean =\dfrac{12 +18 +19+ 20+ 21}{5}=18

Hence, A point estimate of the mean is 18.

You might be interested in
What is the surface area of this design ?
Fed [463]

Answer:

384 8x8=64 64x2=128 128x3=384

Step-by-step explanation:

8 0
3 years ago
How many centimeters in 60 inches?
ivann1987 [24]
152.4cm. 2.54cm = 1in. 60in x (2.54cm/1in) = 152.4cm.
7 0
3 years ago
Can someone do my hw for me
IrinaVladis [17]

Answer:

depends on what the homework is

6 0
2 years ago
Please help assaaaappp
inessss [21]
5k^2 = 25 ^ 3 = 15625
5k^6 = 15625
Hope this helps
7 0
3 years ago
A company makes rubber rafts. 12% of them develop cracks within the first month of operation. 27 new rafts are randomly sampled
rewona [7]

The probability that the number of tested rafts that develop cracks is no more than 3 is <u>.00006</u>.

The true proportion, p for the population is given to 0.12.

Thus, the mean, μ, for the sample = np = 27*0.12 = 3.24.

The sample size, n, given to us is 27.

Thus, the standard deviation, s, for the sample can be calculated using the formula, s = √{p(1 - p)}/n.

s = √{0.12(1 - 0.12)}/27 = √0.003911 = 0.0625389.

We are asked to calculate the probability that the number of tested rafts that develop cracks is no more than 3, that is, we need to calculate P(X ≤3).

P(X ≤ 3)

= P(Z ≤ {(3 - 3.24)/0.0625389) {Using the formula z = (x - μ)/s}

= P(Z ≤ -3.8376114706)

= .00006 {From table}.

Thus, the probability that the number of tested rafts that develop cracks is no more than 3 is <u>.00006</u>.

Learn more about sampling distributions at

brainly.com/question/15507495

#SPJ4

8 0
1 year ago
Other questions:
  • Which fraction is nearest in value
    12·2 answers
  • I want the answer for this sol 2 ( p - (-3) ) + 4 (-3 - 3) + 6 (3 - p)
    5·1 answer
  • The valoe of these seven in 27,459 is how many times value of the 7 in 40,735
    7·1 answer
  • The following number sentence is _____________.
    13·1 answer
  • Factor the perfect square trinomial y2 + 20y + 100.
    10·1 answer
  • 19-3/4n in standard form
    7·1 answer
  • X Cube - 5x Square - 2 x + 24​
    6·1 answer
  • Is it possible to build a triangle with sides lengths of 3,3 and 9
    11·2 answers
  • Answer always, sometimes, or never.
    6·1 answer
  • Becky tells her friend about the Rule of 72 and her friend immediately
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!