7.2
5.
- 0.0071.
- 0.3336.
- 0.9115.
- 0.9998.
7.
- 0.9987.
- 0.9441.
- 0.0375.
- 0.0009.
9.
- =0.9586.
- =0.2088.
- =0.8479.
11.
- Total area = 0.0456.
- =0.0646.
- =0.5203.
13. z=-1.28.
15. z=0.67.
17. z=-2.575.
33. x= 40.62 (at the 9th percentile).
35. x= 56.16 (at the 81st percentile).
37.
- P (x <20) = 0.1587, If 100 were selected at random, 16 would incubate in less that 20 days.
- p (x>22) = 0.1587, If 100 were selected at random, we would expect 16 5o incubate in less that 22 days.
- If 100 were selected at random, we would expect 48 to incubate between 19 and 21 days.
39.
- =0.8657.
- =0.0132.
- =0.7019, or 70.19%.
- =0.1230 or 12.30%.
- =0.9649.
- =0.0359.
41.
- =0.4013 of pregnancies last more than 270 days.
- =0.1587 of pregnancies last fewere than 250 days.
- =0.7590 ofpregnancies last from 240-280 days.
- =0.1894.
- =0.0951.
- Yes, 0.0043 of births are very preterm.
43.
- =0.0764.
- =0.0324.
- =plan manager expects to discard 162 of 5000.
- =manager to manufacture 11,804.
45.
- Yes, mean of 0 implies that the spreads are accurate.
- =0.3228.
- =0.4286.
47.
- 17th percentile for incubation time is 20 days.
- 19-23 days make up the middle 95% of incubation time of the eggs.
56. ACT = 0.96; SAT = 1.02// Score on the sAT is in the 84th percentile, you did better on the SAT.