The mean you found is correct, but the standard deviation is not. Recall that the standard deviation 
(
for sample) of 
points is given by
where 
is the sample size, 
is the sample mean, and 
are the prices listed in the circled column. So
I can't tell if you need to provide any more info beyond this, but given there's a plot of a generalized bell curve, I think you're also supposed to label the plot.
At the center of the bell-shaped/normal distribution is the mean. Notice there are three tick marks to either side of the mean - these are probably supposed to represent prices that fall exactly 1, 2, and 3 standard deviations from the mean. These are, from left to right,
Answer:
The answer is D good luck :)
Answer: (0.3224,0.3976)
Step-by-step explanation:
Given : Sample size : n=625
Number of people check their work email when they are at home =225
The probability of people check their work email when they are at home :
Significance level : 
Critical value : 
The confidence interval for population proportion is given by :-
I think it is 45.5. 1/2 base*height. (9*9 = 81. 81/2 = 45.5.
⌊x⌋ floors the input x. It will always round x down to the an integer that is lower.
Then that is multiplied by 4.
This results in
g(5.7) = 4⌊5.7⌋
g(5.7) = 4 * 5
g(5.7) = 20
The answer to this question is 20.
