-
- 400 < x < 600, 300 < x < 700, and 200 < x < 800
- P(400 < x < 600) ~ 68.26%
P(300 < x < 700) ~ 95.44%
P(200 < x < 800) ~ 99.74%
|
-
- 15.8 < x < 16.2, 15.6 < x < 16.4, and 15.4 < x < 16.6
- P(15.8 < x < 16.2) ~ 68.26%
P(15.6 < x < 16.4) ~ 95.44%
P(15.4 < x < 16.6) ~ 99.74%
|
- a 50%
b. Approx. 84%
c. Approx. 16%
- a 50%
b. Approx. 0.1%
c. Approx. 0.1%
- Approx. 16 people
- Approx. 2 years
- 35,000 miles
- 29,000 miles
- 90 (or above)
- A: 90 or above
B: 78-89
C: 53-77
D: 41-52
F: 40 or below
- A: 97 or above
B: 81-96
C: 50-80
D: 35-49
F: 34 or below
- Yes, the assertion that less than 1% of the CD-players will fail before the warranty
period expires is statistically valid...
For a typical user, the # hours of operation in a 30 month period will be:
3 hr/d × 365.25 d/yr × 2.5 yr ~ 2739 hr
P(t < 2739 hr) |
< P(t < 2750 hr) |
= P(t < 3500 hr) - P(2750 hr < t < 3500 hr) |
~ 50% - (2.15% + 13.59% + 34.13%) |
= 50% - 49.87% |
= 0.13% |
< 1% |
|