The survey asked 948 adults how they would grade the quality of their public schools. each person gave one response. find each probability.
a: 48 b: 238 c: 304 d: 250 f: 108
(a) randomly selecting a person from the sample who did not give the public schools an a
(b) randomly selecting a person from the sample who gave the public schools a grade better than a d
(c) randomly selecting a person from the sample who gave the public schools a d or an f
(d) randomly selecting a person from the sample who gave the public schools an a or b

Determine if the following statement is true or false. the normal curve is symmetric about its​ mean, mu. choose the best answer below. a. the statement is false. the normal curve is not symmetric about its​ mean, because the mean is the balancing point of the graph of the distribution. the median is the point where​ 50% of the area under the distribution is to the left and​ 50% to the right.​ therefore, the normal curve could only be symmetric about its​ median, not about its mean. b. the statement is true. the normal curve is a symmetric distribution with one​ peak, which means the​ mean, median, and mode are all equal.​ therefore, the normal curve is symmetric about the​ mean, mu. c. the statement is false. the mean is the balancing point for the graph of a​ distribution, and​ therefore, it is impossible for any distribution to be symmetric about the mean. d. the statement is true. the mean is the balancing point for the graph of a​ distribution, and​ therefore, all distributions are symmetric about the mean.