19.18/2.8= 6.85 hours or rounded it would be 7 hours
The answer to Part A is 2 15/32
Answer:
= -5
Step-by-step explanation:
Answer:
0.0274
Step-by-step explanation:
The mean is
and the standard deviation is ![\sigma =13.1.](https://tex.z-dn.net/?f=%5Csigma%20%3D13.1.)
Calculate
for ![X=140:](https://tex.z-dn.net/?f=X%3D140%3A)
If
then ![Z\sim N(0,1)](https://tex.z-dn.net/?f=Z%5Csim%20N%280%2C1%29)
and
![Pr(X>140)=Pr(Z>1.9237).](https://tex.z-dn.net/?f=Pr%28X%3E140%29%3DPr%28Z%3E1.9237%29.)
Use table for normal distribution probabilities to get that
![Pr(Z>1.9237)=1-Pr(Z\le 1.9237)=1-0.9726=0.0274.](https://tex.z-dn.net/?f=Pr%28Z%3E1.9237%29%3D1-Pr%28Z%5Cle%201.9237%29%3D1-0.9726%3D0.0274.)
it is the measurement of the positions, motions, and magnitudes of stars.