Answer:
sigma should be used
Step-by-step explanation:
Given that The mean length of time in jail from the survey was four years with a standard deviation of 1.9 years.
The above given is for sample of 27 size.
For hypothesis test to compare mean of sample with population we can use either population std dev or sample std dev.
But once population std deviation is given, we use only that as that would be more reliable.
So here we can use population std deviation 1.4 only.
If population std deviation is used we can use normality and do Z test
Answer:
i will answer you other if u rate me brainliest
Answer: At t=0.015 hours when the car 0.6 miles from the check point.
Step-by-step explanation:
Since we have given that
Distance traveled by him towards a speed check point = 1.4 miles
Speed at which he is travelling = 52 miles per hour
Let the time taken by him be x
Since we have the equation

where<em> </em><em>d</em><em> </em>denotes distance
and <em>t </em>denotes time.
If we have given that the car 0.6 miles from the check point.
So, we put the value of <em>d</em> in place of it .

So, at t=0.015 hours when the car 0.6 miles from the check point.
Answer:
1/4
Step-by-step explanation:
Andrew found a pan of brownies with 3/4 of the brownies left. He ate 1/3 of what was left. What portion of the whole brownies did he eat?
The size of the brownies Andre ate =
1/3 of 3/4
= 1/3 × 3/4
= 1/4
Therefore, the portion of the whole brownies that Andre ate was 1/4
Answer:
A
Step-by-step explanation: