Homework Help: statistics

Posted by cm on Monday, May 7, 2012 at 8:23pm.

according to data from the american medical association, 10% of us are left handed. If three people, are randomly selected find the probability that they are all left handed. If groups of 50 people are randomly selected, what is the mean and stadard deviation of left handed people.

statistics - MathGuru, Tuesday, May 8, 2012 at 4:54pm
For the first part:

You can use a binomial probability table, or calculate by hand using the following formula: P(x) = (nCx)(p^x)[q^(n-x)]

For the second part:

Use the binomial approximation to a normal distribution.
mean = np = 50 * .10 = ?
standard deviation = √npq = (√(50 * .10 * .90) = ?
Note: q = 1 - p
Finish the calculation.

I hope these few hints will help.

Answer this Question

Related Questions

Statistics - One-fifth of the population is left-handed. A random sample of 20 ...
statistics - Data shows that 88% of the people in a certain population are right...
statistics - in a sample of 1000 people <525 men and 475 women>,...
Statistics - A study shows that 10% of americans are left-handed. Find the ...
8th grade - People can be left-handed, right-handed or ambidextrous. The number ...
statistics - Data shows that 93% of the people in a certain population are right...
math - the chippa soccer association calculates its profit from gate taking ...
Algebra 2 - stats and probability - I need someone to tell me how to set these ...
statistics - Assume that 90% of the general population is right-handed. Suppose ...
7th Pre-Algebra Word Problem - Approximately one-seventh of the people in the ...

For Further Reading

First Name:
School Subject:
Answer: