The average teachers’ salary in a certain state is $57,337 . Suppose that the distribution of salaries is normal with a standard deviation of $7500 . Assume that the sample is taken from a large population and the correction factor can be ignored. Use a TI-83 Plus/TI-84 Plus calculator and round the answer to at… Continue reading Prob and Stat

# Category: Mathematics – Probability

## Probability theory

There are two boxes, containing 1 black ball and 10 white balls and 6 black balls and 7 white balls respectively. 4 Balls are randomly taken from the first box and put in the second box. Then one ball is drawn out from the second. Find the probability that: 1) the ball is white2) only… Continue reading Probability theory