Of all the foreclosures in the United States, 48% are caused by disability. Injured or sick people are unable to work, thus losing their job and income. With no income, they cannot make payments on their mortgages and the bank executes a foreclosure. Since 20 foreclosures are audited by a large lending institution, find the probability that nine of the foreclosures are due to disability.

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables