Which of the following describe a set of data whose histogram approximates
a normal curve?
check all that apply.
o
a. most of the observations are near the mean of the data set.
b. the observations trail off at values far from the mean.
o
c. the histogram of the data is exactly the same as the normal
curve
o
d. the sum of the data values must be 1
e. all of the data values have to be positive.

The parabola opens: y=√x-4 (principal square root) up down right left

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?

Factor and solve to find roots x squared -x - 90 =0