# 7.12: Chapter Solution (Practice + Homework)


1.

1. 3.

0.0003

25.07

7.

1. 9.

2,507.40

1. 13.

$$N(10, \frac{10}{8}))$$

0.7799

17.

1.69

19.

0.0072

21.

391.54

23.

405.51

25.

Mean = 25, standard deviation = 2/7

26.

Mean = 48, standard deviation = 5/6

27.

Mean = 90, standard deviation = 3/4

28.

Mean = 120, standard deviation = 0.38

29.

Mean = 17, standard deviation = 0.17

30.

Expected value = 17, standard deviation = 0.05

31.

Expected value = 38, standard deviation = 0.43

32.

Expected value = 14, standard deviation = 0.65

33.

0.23

34.

0.060

35.

1/5

36.

0.063

37.

1/3

38.

0.056

39.

1/10

40.

0.042

41.

0.999

42.

0.901

43.

0.301

44.

0.832

45.

0.483

46.

0.500

47.

0.502

48.

0.519

49.

1. 51.
1. 53.
1. 55.
1. 57.
1. 59.

b

64

61.

1. 62.

400

2.5

64.

25

65.

0.0087

66.

0.0064, 0.0064

67.

1. 68.
1. 69.
1. 70.

0.955

0.927

72.

0.648

73.

0.101

74.

0.273

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