Question

7. using the following, construct a complete frequency distribution include the mean, variance, standard deviation. Also graph the frequency histogram, polygon and ogive. indicate modal class, median class and describe the distribution.

class limits frequency

28-34 4

35-41 12

42-48 20

49-55 10

56-62 4

9. find the weighted mean for three exams if the first one was worth 25% and the student received a 92, the second was worth 40% and the student received a 86 and the third was worth 35% and the student received a 76

10. It has been reported that 45% of all cars on the highway are traveling at speeds in excess of 70 mph. If the speeds of eight random automobiles are measured via radar

a. what is the probability that exactly 3 cars are speeding

b. at least one car is going over 70 mph

Answer 1