The probability that an individual is left-handed is 17%. In a class of 40 students, what is the mean and standard deviation of the number of left-handers in the class?
2)How many different codes of 4 digits are possible of the first digit must 3,4,or 5and if the code may not end in 0?
3)There are 3 balls in a hat, one blue, one red, and one green. Perform an experiment of randomly choosing a ball from the hat and the n rolling a six-sided die. Draw a tree diagram and list the sample space for the experiment.