Choose the correct problem formulation: A Statistics Department is contacting al
ID: 3057698 • Letter: C
Question
Choose the correct problem formulation: A Statistics Department is contacting alumni by telephone asking for donations to help fund a new computer laboratory. Past history shows that 80% of the alumni contacted in this manner will make a contribution of at least $50. A random sample of 20 alumni is selected. Let x represent the number of alumni that makes a contribution of at least $50. What is the probability that exactly 15 alumni will make a contribution of at least $50?
P(x <= 15) - P(x<=14)
P(x <=18) - P(x <= 13)
P(x <= 16)
1 - P(x <= 15)
None of the above.
a.P(x <= 15) - P(x<=14)
b.P(x <=18) - P(x <= 13)
c.P(x <= 16)
d.1 - P(x <= 15)
e.None of the above.
Explanation / Answer
Choose the correct problem formulation: A Statistics Department is contacting alumni by telephone asking for donations to help fund a new computer laboratory. Past history shows that 80% of the alumni contacted in this manner will make a contribution of at least $50. A random sample of 20 alumni is selected. Let x represent the number of alumni that makes a contribution of at least $50. What is the probability that exactly 15 alumni will make a contribution of at least $50?
P(x <= 15) - P(x<=14)
P(x <=18) - P(x <= 13)
P(x <= 16)
1 - P(x <= 15)
None of the above.
a.P(x <= 15) - P(x<=14)
b.P(x <=18) - P(x <= 13)
c.P(x <= 16)
d.1 - P(x <= 15)
e.None of the above.