What is slope of perpendicular line

How can you find the mean absolute deviation (mad) for this set of data?

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1

Arandom sample of size n 64 is taken from a population with population proportion p 0.38 describe the sampling distribution of p. draw a graph of this probability distribution with its a. mean and standard deviation. b. what is the probability that the sample proportion is greater than 0.5? what is the probability that the sample proportion is less than 0.3? d. what is the probability that the sample proportion is between 0.35 and 0.45?