Questions I'm struggling with Part 1

1.)

The table below gives the number of people who attended the U.S. Open tennis tournament in Flushing Meadows for the past 7 years. However, due to a typing error the attendance for 2005 was entered incorrectly and should have been 631,870. Which measure of variability remains unchanged after correcting the data set?

Year Attendance

2007 715, 587

2006 640,000

2005 659,538

2004 531,870

2003 615,456

2002 628,738

2001 639,343

A.) Variance B.) Standard deviation C.) No information provided D.) Range

2.) A study on the IQ's of 300 six year-old children yielded the following frequency distribution. Find the estimated variance of the IQ's for the six-year-olds.

IQ Frequency

150-159 5

140-149 9

130-139 19

120-129 37

110-119 79

100-109 69

90-99 65

80-89 17 the frequencys are the numbers that are not devided with a dash. example 5, 9, 19, 37 etc

3.) The fifth percentile for wait times at emergency rooms across the 50 states in the United States of America was 135 minutes, the fiftieth percentile was 175 minutes, and the ninety-fifth percentile was 215 minutes. Determine the shape of the distribution of wait times in an emergency room.

A.) Symmetric B.) Positively skewed C.) Negatively Skewed

D.) Unknown