Answer:
No of cars drove over 35 miles per hour = 6
Step-by-step explanation:
total cars = 800
if 0.75% of total cars exceeded 25 miles per hour speed limit by more than 10 miles per hour. It means that 0.75% of total cars drove over 35 miles per hour.
Now, No of cars that drove over 35 miles per hour = 0.75% of 800
=
= 6
So, 6 cars drove over a speed of 35 miles per hour
Answer:
(A) The 25th percentile is 20.
(B) The mean of the data set is 20 and the median of the data set is 25. The data set is left-skewed.
Step-by-step explanation:
The data set arranged in ascending order is:
S = {15, 20, 22, 25, 28, 40, 55}
(A)
Compute the 25th percentile as follows:
Thus, the 25th percentile is 20. This value implies that exactly 25% of the observations are less than 20.
(B)
Compute the sample mean as follows:
Compute the median as follows:
For a set with odd number of observations, the median value if the middle value.
The middle value is 25.
Thus, the mean of the data set is 20 and the median of the data set is 25.
The Mean < Median.
This implies that the data set is left-skewed.