Burana tower stands near Tokmak town. We demand: a person who has been on top of the tower 5 minutes, must go down; while he comes down, people those below the tower must wait. Climbing the tower stairs and descending the stairs of the tower take one minute. Every moment on the stairs there can be only one person. Now there is no one at the top of the tower, at the foot of the tower there is a person in line A. After T minutes, B more people will come up. After what time (minutes) all people will come out of the tower (the last person will go down the stairs)?

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.