Which equation does the graph of the systems of equations solve? a) x2 − 2x − 1 = −x2 + 3 b) x2 − 2x + 3 = x2 − x + 1 c) −x2 − 2x + 2 = 2x2 − x − 2 d) −x2 − 2x + 1 = 2x2 − x + 2

List the 10 possible samples (without replacement) of size 3 3 that can be obtained from the population of five officials.

Cor d? ? me ? max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. the design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 99% confidence interval estimate of μ, the mean duration of game play. 4028 4316 4816 4650 4036 5010 4833 4331 4307