# math

posted by
**helga**
.

A random sample of the houses in a particular city is selected and each of the houses in a particular city is selected and each of the house's level of radon gas is measured. The values collected are given in the table below in parts per million (ppm).

4 8 13 6 7 3 9 8 11 8

a. Give a point estimate for u=the average level of radon gas in a house in this particular city.

b. Let pi=the proportion of houses in this city having radon levels exceeding 8 ppm. Give a point estimate of pi.

c. Give a point estimate of the median level or radon gas in a house in this city.

d. Give a point estimate of the standard deviation of the level of radon gas in a house in this city.

e. What conditions are required in order to have a valid confidence interval for u in this data set?