Dimitri's table top is a whole number of
1 answer:
You might be interested in
Answer:
Sample size should be atleast 617
Step-by-step explanation:
given that a 95% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit.
i.e. margin of error <0.3
Std devition sample = 3.8
For 95% assuming sample size large we can use z critical value
Z critical = 1.96
we have
Sample size should be atleast 617 to get an accurate margin of error 0.3
The expressions represent the total time of her trip in hours is.
Given that,
For the first 80 miles of her road trip, Lina travels 10 miles/hour slower than she did for the remaining 50 miles of her trip.
It represents Lina's speed during the first part of her trip.
We have to determine,
Which expressions represent the total time of her trip in hours?
According to the question,
Let the speed traveled during the first part of the trip be "s".
The formula for calculating the distance is expressed as:
For the first part of the journey:
Distance = 80 miles
Time =
And Speed = s
Substitute all the values in the formula,
For the second part of the trip;
Distance traveled = 50 miles
Speed = s + 10 (10miles/hour faster than the first part of the trip)
time =
Substitute all the values in the formula,
Therefore,
Adding both the time to represent the total time of her trip in hours,
Hence, The required expressions represent the total time of her trip in hours is.
For more details refer to the link given below.
Answer: