# statistics

posted by .

Pinworm infestation commonly found in kids can be treated with the drug pyrantel pamoate. Research shows the treatment is effective about 90% of cases. The drug is administered to 25 kids.

What is the probability that exactly 23 of them are cured?

What is the prob. that more than 23 of them are cured?

What is the prob. that at most 23 of them are cured?

What is the expected # of kids that will be cured using this treatment?

• statistics -

I would solve this problem using basic combinatorial methods. Hint: an EXCEL spreadsheet is very helpful in these types of problems.

The probability that 23 are cured is exactly equal to the probability that 2 are not cured. So, 25-choose-2 is 24*25/2 = 300. So, the probability of seeing exactly 2 not cured is 300*(.9^23)*(.1^2) = 26.588%.

Take it from here to solve the rest of the problems.

## Similar Questions

1. ### STATISTICS

PINWORM INFESTATION COMMONLY FOUND IN KIDS CAN BE TREATED WITH THE DRUG PYRANTEL PAMOATE. RESEARCH SHOWS THE TREATMENT IS EFFECTIVE IN ABOUT 90% OF CASES. DRUG IS ADMINISTERED TO 25 KIDS WHAT IS THE PROBABILITY THAT EXACTLY 23 OF THEM …
2. ### statistics

PINWORM INFESTATION COMMONLY FOUND IN KIDS CAN BE TREATED WITH THE DRUG PYRANTEL PAMOATE. RESEARCH SHOWS THE TREATMENT IS EFFECTIVE IN ABOUT 90% OF CASES. DRUG IS ADMINISTERED TO 25 KIDS WHAT IS THE PROBABILITY THAT EXACTLY 23 OF THEM …
3. ### Physiology

Fill in the table with information about the action of pharmaceutical drugs on neurological disorders. Name of drug 1.Valium a.Neurotransmitter affected b.Does the drug enhance or reduce the effect of the neurotransmitter?
4. ### Statistics

A research article reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different …
5. ### Statistics

True or False Question. I need help please. A sientific paper reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. …
6. ### math

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with …
7. ### math

In a livestock research stations a new drug for a certain fowl disease is being tried. Samples of 36 fowls were diagnosed to have the disease. Twenty (20) fowls were treated with the drug and the rest were not. (a) Calculate the probability …
8. ### math

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with …
9. ### statistics

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with …
10. ### math

. If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with …

More Similar Questions