The time it takes a randomly selected employee to perform a task is normally distributed with a mean value of 120 seconds and standard deviation of 20 seconds. Calculate the probability that a randomly selected employee will complete: 2.1.1 The task within 100 to 130 sec 2.1.2 In more than 75sec
The following table shows the incomes of super 10 taxis by year
|
YEAR |
x-CODE |
INCOME-y |
|
2001 |
1 |
28 |
|
2002 |
2 |
31 |
|
2003 |
3 |
34 |
|
2004 |
4 |
30 |
|
2005 |
5 |
35 |
|
Total |
15 |
158 |
|
a) |
Plot the data on a |
|
|
b) |
Compute Pearson’s |
|
|
c) |
Compute Spearman’s ranking (rho) |
|
QUESTION TWO
The time it takes a randomly selected employee to perform a task is
Calculate the probability that a randomly selected employee will complete:
2.1.1 The task within 100 to 130 sec
2.1.2 In more than 75sec
2.2 If it is estimated that 30% of all students who fall under the Business Economics and Management Department at Richfield have a valid driver’s license. What is the probability of this in a sample of 10 students?
2.2.1 Exactly 4 have a valid driver’s license?
2.2.2 At least 2 have a valid driver’s license?
2.2.3 More than 9 have a valid driver’s license?
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