<span>The standard error of a distribution of sample proprtions is defined as the standard deviation of the distribution and is symbolized by
and is calculated by the formula

</span>.
Given a <span>random
sample of n = 800 observations and a sample proportion
p = 0.44.
To test:

The
standard error rounded to four decimal places is given by:

</span>
Answer:
0.7857
Step-by-step explanation:
Given :
Mean = 69 inches
Standard deviation, = 2.8 inches
The Zscore of a man who is 71.2 inches
The ZSCORE is obtained using the relation :
Zscore = (Score, x - mean) / standard deviation
Zscore = (71.2 - 69) / 2.8
Zscore = 2.2 / 2.8
Zscore = 0.7857
Answer:
x =7, y = 0
Step-by-step explanation:

Option B:
is the area of the compact disc.
Explanation:
The diameter of the compact disc is
.
To determine the area of the compact disc, let us substitute the values in the area of the circle formula,
where 
Substituting the value of d in
, we get,

Thus,
and
. Let us substitute these values in
, we get,

Simplifying, we have,

Multiplying, we get,

Thus, the area of the compact disc is 
Hence, Option B is the correct answer.