The mean of a normal probability distribution is 500; the standard deviation is 10.
(a) About 68% of the observations lie between what two values?

(b) About 95% of the observations lie between what two values?

(c) Practically all of the observations lie between what two values?

a) (490,510)

b) (480,520)

c) (470,530)                                                  

Step-by-step explanation:

Mean, μ = 500

Standard Deviation, σ = 10

Empirical Rule:

a) 68% of the observations

About 68% of data lies within 490 and 510.

b) 95% of the observations

About 95% of data lies within 480 and 520.

c) All the observations

All of the observations lie between 470 and 530.

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m