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HACTEHA [7]
3 years ago
6

Samples of size n = 600 are taken from a telephone survey, and the mean age is taken for each sample. What is the distribution o

f the sample means?
A. skewed to the left
B. normal (approximately)
C. not enough information provided
D. skewed to the right
Mathematics
1 answer:
Nonamiya [84]3 years ago
6 0
The answer in B. For complicated statistics reasons the Central Limit Theorem states that, for sample sizes of above 25 (or 30 depending on the text!), the distribution of sample means is approximately normal regardless of the distribution of the parent distribution
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Student made five tetrahedrons, a three dimensional figure with four triangular faces and labeled the faces 1-4. use an equation
JulsSmile [24]
The probability is 1/1024.

Each tetrahedron has a 1/4 chance of landing on 3, since there are 4 sides and only one of them is marked 3.

Each tetrahedron roll is independent, since no roll is affected by another.

This means we multiply the probabilities:
1/4(1/4)(1/4)(1/4)(1/4) = 1/1024
3 0
3 years ago
Read 2 more answers
After dans holiday. Dan has 50 new email messages in his inbox . 13 of them are attachements. what proportion of the email messa
dimulka [17.4K]

Answer:

26%

Step-by-step explanation:

Given that Dan has 59 new email messages and 13 have attachment then the proportion that have attachments may be expressed as a ratio of the number with attachments to the total number of emails.

Hence proportion of the email messages have attachments as a percentage

= 13/50 * 100%

= 26%

This means that 26% of the emails received have attachments

6 0
3 years ago
Please help!!!<br> What is the area of the trapezoid?
olga nikolaevna [1]
330m^2 is the answer
6 0
3 years ago
Is anyone good with this? I need help finding the answer.
dybincka [34]
To solve this problem, we have to find the perimeter of the shape.
we already know that two of the sides are 82m, all we need to do is find the circumference of the semicircles.
to find circumference, you multiply the diameter of a circle by pi. since we have two identical semicircles, we have one full circle. 66•3.14=207.24
207.24+82+82=371.24
the answer is 371.24m
3 0
3 years ago
Please help me out with this..............
Andrews [41]

Answer:

C

Step-by-step explanation:

when x=0, y=0, so B is impossible

when X=2, Y=1,

and thus C is correct

6 0
3 years ago
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