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1) A new drug is found to be effective 40% of the time, then what is...

1) A new drug is found to be effective 40% of the time, then what is the probability that in a random sample of 4 patients, it will be effective 2 times? (using binomial distribution) *

0.3456

0.7231

0.4564

0.3125

2)

The average marks scored by students in a test are normally distributed with a mean score of 120 and a standard deviation of 20. What is the proportion of students having a score between 100 and 130? *

0.5499

0.5328

0.4328

0.6789

Math   Statistics-And-Probability   
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