If spine bone density is normally distributed in young women with a mean of 1.0 g/cm2 and a standard deviation of .10 g/cm2, then how many young women out of 100 would you expect to have bone densities less than .85 g/cm2?
If the relative frequency of boys among newborn children in the USA is .513, what's the probability that exactly 4 of the next 5 births will be boys?
A doctor performs 8 operations in a given day. Assume that the operations are independent, and each operation is a success with probability 0.95. What's the probability that the doctor has two or more failed operations on any given day?
In a randomized trial, 200 subjects were to be randomly assigned either to the drug treatment group or to the placebo group. Researchers flipped a coin to decide each participant's treatment assignment. After randomization, 112 subjects were in the treatment group and 88 were in the control group. What's the probability that 112 or more subjects could end up in the treatment group purely by chance?
This question was answered on: May 23, 2022
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