# Thread: I have 10 questions I can't seem to solve no matter what i do...

1. ## I have 10 questions I can't seem to solve no matter what i do...

I understand this alot. If someone can even show me how to solve a few of these....I'd a really appreciate it. Thank you.

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

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

4.) A data distribution has a mean of 10 and a standard deviation of 2. Suppose we do not know if the distribution is bell-shaped or not. Estimate the proportion of data that falls between 8 and 12.

A.) Cannot be determined B.) 99.97% C.) 95% D.) 68%

5.) A data distribution has a mean of 500 and a standard deviation of 100. Assume the distribution is bell-shaped. Estimate the data values that define the middle 95% of the data.

A.) -2 and 2 B.) 300 and 700 C.) 400-800 D.) -1000 and 1000

6.) A man can travel to work changing buses twice. For this route he has an option between two routes, A and B. From A has 3 routes, C, D, and E and from B has two routes, F and G. However, three of the routes, B, C, and G are one-ways. B and G can used to travel from home to work and C can be used to travel from work to home. How many possible routes does the man have to choose from while traveling from home to work?

A.) 4 B.) 5 C.) 7 D.) 9

7.) How many random samples of 2 can be chosen from a population of size 10?

A.) 10 B.) 45 C.) 2 D.) 1814400

8.) A bag contains 5 red balls and 4 yellow balls. If we select two balls at random, what is the probability that the second ball is red in color given that the first ball is also red in color? Assumre sampling without replacement.
A.) 0.31 B.) 0.05 C.) 0.28 D.) 0.40

9.) A single fair die is rolled twice in succession. Find the probability of observing a multiple of 3 given that you ovserve an even number on the first roll.

A.) 0.167 B.) 0.027 C.) 0.33 D.) 0.67

10.) A big jar of taffy holds 500 salt water taffies. 310 taffies are red in color and 150 are strawberry flavored. Also 350 taffies are strawberry flavored red taffies. Find the probability that a randomly chosen taffy from this jar is red in colored or is stawberry flavored.

A.) 0.32 B.) 0.50 C.) 0.22 D.) 0.18

I understand this alot. If someone can even show me how to solve a few of these....I'd a really appreciate it. Thank you.

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

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

4.) A data distribution has a mean of 10 and a standard deviation of 2. Suppose we do not know if the distribution is bell-shaped or not. Estimate the proportion of data that falls between 8 and 12.

A.) Cannot be determined B.) 99.97% C.) 95% D.) 68%

5.) A data distribution has a mean of 500 and a standard deviation of 100. Assume the distribution is bell-shaped. Estimate the data values that define the middle 95% of the data.

A.) -2 and 2 B.) 300 and 700 C.) 400-800 D.) -1000 and 1000

6.) A man can travel to work changing buses twice. For this route he has an option between two routes, A and B. From A has 3 routes, C, D, and E and from B has two routes, F and G. However, three of the routes, B, C, and G are one-ways. B and G can used to travel from home to work and C can be used to travel from work to home. How many possible routes does the man have to choose from while traveling from home to work?

A.) 4 B.) 5 C.) 7 D.) 9

7.) How many random samples of 2 can be chosen from a population of size 10?

A.) 10 B.) 45 C.) 2 D.) 1814400

8.) A bag contains 5 red balls and 4 yellow balls. If we select two balls at random, what is the probability that the second ball is red in color given that the first ball is also red in color? Assumre sampling without replacement.
A.) 0.31 B.) 0.05 C.) 0.28 D.) 0.40

9.) A single fair die is rolled twice in succession. Find the probability of observing a multiple of 3 given that you ovserve an even number on the first roll.

A.) 0.167 B.) 0.027 C.) 0.33 D.) 0.67

10.) A big jar of taffy holds 500 salt water taffies. 310 taffies are red in color and 150 are strawberry flavored. Also 350 taffies are strawberry flavored red taffies. Find the probability that a randomly chosen taffy from this jar is red in colored or is stawberry flavored.

A.) 0.32 B.) 0.50 C.) 0.22 D.) 0.18
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