WNLS BOOK

Systolic blood pressure readings for a population of adults are normally distributed with a mean of 119 and a standard deviation of 16. (

reading above 140 is considered to be high blood pressure.) Begin by converting the given blood pressure reading into a z-score. Then

use the accompanying table of z-scores and percentiles to find the percentage of people with blood pressure readings below 143.

Click the icon to view the table of z-scores and percentiles.

The z-score is

(Type an integer or a decimal.)

The percentage of people with blood pressure readings below 143 is

(Round to two decimal places as needed.).

1: z-Scores and Percentiles

z-Score

-4.0

-3.5

-3.0

-2.9

-2.8

-2.7

-2.6

-2.5

-2.4

-2.3

-2.2

-2.1

-2.0

-1.9

z-Scores and Percentiles

Percentile -Score

0.003

0.02

0.13

0.19

0.26

0.35

0.47

0.62

0.82

1.07

1.39

1.79

2.28

2.87

3.59

4.46

5.48

6.68

8.08

9.68

-1.8

-1.7

-1.6

-1.5

-1.4

-1.3

-1.2

11.51

-1.1 13.57

Percentile -Score Percentilez-Score

15.87

0.0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

-1.0

-0.95 17.11

-0.90 18.41

-0.85

19.77

-0.80

21.19

-0.75

22.66

-0.70

24.20

-0.65

25.78

-0.60

27.43

-0.55

29.12

-0.50 30.85

-0.45

32.64

-0.40

34.46

36.32

-0.35

-0.30

38.21

-0.25

40.13

-0.20

42.07

-0.15

44.04

-0.10

46.02

-0.05

0.0

48.01

50.00

0.55

0.60

0.65

0.70

0.75

0.80

0.85

0.90

0.95

1.0

50.00

51.99

53.98

55.96

57.93

59.87

61.79

63.68

65.54

67.36

69.15

70.88

72.57

74.22

75.80

77.34

78.81

80.23

81.59

82.89

84.13

11

1.2

1.3

14

15

16

17

18

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

Percentile

86.43

88.49

90.32

91.92

93.32

94.52

95.54

96.41

97.13

97.72

98.21

98.61

98.93

99.18

99.38

99.53

3.0

3.5

4.0

99.65

99.74

99.81

99.87

99.98

99.997