4) Car Failures. In Exercises 19-22, refer to the accompanying table, which
describes results of roadworthiness tests of Ford Focus cars that are 3 years old
(based on data from the Department of Transportation). The random variable x
represents the number of cars that failed among six that were tested for
roadworthiness.
X
0
1
2
3
4
5
6
P(x)
0.377
0.399
0.176
0.041
0.005
0+
0+
19. Find the mean and standard deviation for the
numbers of cars that failed among the six cars that are tested.
