Answer:
1. dave has a low chance of rollerblading if he is focusing on his career.
Step-by-step explanation:
Answer:
The null hypothesis is
.
The alternative hypothesis is 
Step-by-step explanation:
Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years.
At the null hypothesis, we test if the mean is of 2.5 years, that is:

A study was then done to see if the mean time has increased in the new century.
At the alternative hypothesis, we test if the mean has increased, that is, if it is above 2.5 years. So

The answer your looking for is C
Answer:
140m
Step-by-step explanation:
multiply 50 and 4.2 which give you 210 then divide by 1.5 and your answer is 140m