Looking for statistics help

Week #1 Quiz - There are only three questions this week. The number of questions will increase in future weeks

1. The following data, on the number of children born per 1,000 women, is from theCurrent Population Reports—Fertility of American Women: 2008

What is the modal number of children born to American women in 2008?

• 1     0 children
• 2     1 child
• 3     2 children
• 4     3 children

1. The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $5. According to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?
2. Between 230 and 240 dollars
3. Between 220 and 250 dollars
4. Between 175 and 295 dollars
5. Less than 220 dollars or more than 250 dollars
6. Less than 230 dollars or more than 240 dollars

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1. A random sample of 25 customers was chosen in UMUC MiniMart between 3:00 and 4:00 PM on a Friday afternoon. The frequency distribution below shows the distribution for checkout time (in minutes).

Complete the frequency table with frequency and relative frequency.

What percentage of the checkout times was less than 3 minutes?