You can play around with lots of Z table stuff at
http://davidmlane.com/hyperstat/z_table.html
have fun
Math homework please help!!
2. Suppose that people’s weights are normally distributed, with mean 175 pounds and a standard deviation of 6 pounds. Round to the nearest hundredth of a percent
a. What percent of the population would weigh between 165 and 170 pounds?
b. What percent of the population would you expect to weigh more than 182 pounds?
c. What percent of the population would you expect to weigh between 172 and 180 pounds?
d. What percent of the population would you expect to be heavier than 163 pounds?
3. The weight of a can made from a machine is normally distributed with a mean of 25 grams and a
standard deviation of 0.4 grams. What percentage of the cans from this machine would not meet the
minimum required weight of 24 grams? Round to the nearest hundredth of a percent
4. Suppose that for a certain exam given nationwide is normally distributed with a mean of 80 and a
standard deviation of 3? Round to the nearest hundredth of a percent
a. What percent of the population would score higher than an 82?
b. What percent of the population would score between 78 and 85?
c. What percent of the population would score between 74 and 78?
d. What percent of the population would score above a 76?
2 answers
i don't understand what information to put in and how to find the percent