Statistic -need help! Thank you! 1. A doctor can prescribe one of two drugs to t
ID: 3249402 • Letter: S
Question
Statistic -need help! Thank you!
1. A doctor can prescribe one of two drugs to treat a certain disease. Drug A will cure 75% of the cases but has unwanted side effects in 40% of the cases. Drug B will cure 50% of the cases and has unwanted side effects in 30% of cases. 60 patients are given drug A and 80 patients are given drug B. How many patients would you expect to experience unwanted side effects?
a)30
B)48
c)49
d)85
e) 88
2.T he opera house has 2000 seats. There are 1200 seats on the main floor and 800 in the balcony. 40% of those in the balcony buy a program while 50% of people on the main floor buy a program. On opening night of The Lion King, every seat is taken. If an audience member is selected at random, what is the probability that they bought a program?
a)22.5 %
b)42
c)46
d)90%
92%
3. A 6-sided die is rolled three times. What is the probability that all three rolls resulted in different numbers? a)0.500 b)0.556 c)0.578 d)0.596 e)0.606
Explanation / Answer
3. P( 3 rolls all lead to different numbers)
= P( choose any one)*P( choose any of remaining 5 from 6)*P( choose any of remaining 4 from 6)
= (1)(5/6)(4/6)
= .556