The employee's supervisor wants to conduct a study to determine whether county residents would want a snack bar in the park. She decides to administer a
questionnaire to 100 residents who plan to use the park.
Which statements are correct? Select the three that apply.
A. The study is biased.
B. The study is a sample survey.
C. The study is based on self-reporting.
D. The study uses an observational design.
E. The study uses an experimental design.

Now 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.

The anwser cause i do not understand just plez

How does reflecting or rotating a figure change the interior angles of the figure?