Answer:
Step-by-step explanation:
Given are the top 40 stocks on the over-the-counter (OTC) market, ranked by percentage of outstanding shares traded on one day last year
We have to construct a relative frequency histogram.
Frequency Table
Class Count
2-3.69 19
3.7-5.39 12
5.4-7.09 5
7.1-8.79 3
8.8-10.49 0
10.5-12.19 1
Your Histogram
Mean 4.387
Standard Deviation (s) 1.87138
Skewness 1.95377
Kurtosis 5.43198
Lowest Score 2.61
Highest Score 11.88
Distribution Range 9.27
Total Number of Scores 40
Number of Distinct Scores 39
Lowest Class Value 2
Highest Class Value 12.19
Number of Classes 6
Class Range 1.7
Frequency histogram is attached
More than 40% is approximately 21
i.e.
proportion
SOLUTION
The mean is 4min
standard deviation is 1min
the z score is
where
then we have
The probability the call lasted less than 3 min will be
Therefore, the probability that (z < -1 ) is
[tex]\begin{gathered} Pr(z<-1)=Pr(0Hence, the percentage of the calls that lasted less than 3 min is 16%