# Looking for statistics help

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

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

| 0 | 1 | 2 | 3 | 4 | 5 or more |

| 21% | 17.0% | 45.7% | 10.6% | 3.9% | 1.8% |

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**

- 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?
**Between 230 and 240 dollars****Between 220 and 250 dollars****Between 175 and 295 dollars****Less than 220 dollars or more than 250 dollars****Less than 230 dollars or more than 240 dollars**

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**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).**

Checkout Time (in minutes) | Frequency | Relative Frequency | |

1.0 - 1.9 | 2 | ||

2.0 - 2.9 | 8 | ||

3.0 - 3.9 | |||

4.0 - 5.9 | 5 | ||

Total | 25 | ||

Complete the frequency table with frequency and relative frequency.

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

**Answers 1**

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