statistics
posted by lauren .
A drug is essential to the profileration of lymphocytes can cause kidney damage in 1% of patients. If the drug is given to 30 patients, find:
A)the probability exactly 1 patient suffers kidnay damage
B)the probabaility that less than 2 patients suffer kidney damage
c) the probability that at least 3 patients suffer kidney damage
d) the expected # of people who will suffer kidney damage
e) the standard deviation of the number of people who will suffer kidney damage

p = .01
binomial distribution, n = 30
A)
p(k) = C(30,k) p^(k) p^(30k)
for k = 1
p(1) = [30!/(1!29!)]* .01^1 * .99^29
= 30*.01*.747
=.224
B)
That would be zero or one patient. We know p(1) = .224 so find p(0)
p(0) = (30!/0!30!) *.01^0 * .99^30
= 1 * 1 * .740
=.740
so the probability of less than 3 is .224+.740 = .964
C. 1.964 = 0.036
D. mean = n p = 30*.01 = 0.3
E. variance = n p(1p) =30*.01*.99 = .297
s = sqrt(.297) = .545
Respond to this Question
Similar Questions

statistics/probability
in testing a new drug. researchers found that 20% of all patients using it will have a mild side effect. a random sample of 14 patients using the drug is selected. find the probability that: a) exactly three will have mild side effects. … 
PROBABILITY
There are 100 patients in a hospital with a certain disease. Of these, 10 are selected to undergo a drug treatment that increases the percentage cured rate from 50 percent to 75 percent. What is the probability that the patient received … 
statistics
In a clinical trial of the drug Viagra, 117 patients reported headaches and 617 did not. What is the probability that a patient taking the drug will NOT experience headache symptoms? 
Statistics
. In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild … 
statistics
. In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild … 
Algebra227
A drug trial is testing the effectiveness of two drugs. If 40 patients are given Drug A, 80 patients are given Drug B, and 50 patients are given a placebo, what is the probability that a patient will not be given a placebo? 
statistics
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 12 patients using the drug is selected. If you wanted to find the probability that exactly three will have … 
Science
5. A team of scientists is testing a new drug on AIDS patients. They expect patients to develop fewer AIDSrelated illnesses when given the drug, but they don't expect the drug to cure AIDS. Thought Process: a. What is the independent … 
statistics
4.2. A new drug that treats patients with anxiety has a 60% success rate in improving the patientâ€™s condition. For a random sample of eight patients taking this drug, determine the probability that: 4.2.1. Four patients have improvement … 
Business statistics
A new drug that treats patients with anxiety has a 60% success rate in improving the patientâ€™s condition. For a random sample of eight patients taking this drug, determine the probability that: 4.2.1. four patients have improvement …