STATISTICS REVIEW

The following data represents the high temperatures for the next several days in Buffalo, NY: {17, 26, 3, 13, 29, 34, 32, 30, 41}.  Find the mean absolute deviation.  Round your answer to the nearest hundredth of a degree.  

• 25.25
• 9.33
• 9
• 10.33

Which of the following values represent the standard deviation and variance for the data?  

• Standard Deviation= 9.33; Variance= 3.05
• Standard Deviation= 9.33; Variance=  87.05
• Standard Deviation= 11.16; Variance= 124.55
• Standard Deviation= 11.16; Variance=  3.34

The wind speeds throughout the month of April were normally distributed with a mean of 17 mph and a standard deviation of 4 mph.  What percent of the days had wind speeds between 5 and 13 mph?

• 68.2 %
• 15.8 % 
• 2.3% 
• 15.9 % 

The wind speeds throughout the month of April were normally distributed with a mean of 17 mph and a standard deviation of 4 mph.  What percent of the days had wind speeds of at least 9 mph?

• 97.7 % 
• 100 % 
• 68.2% 
• 2.3%

The wind speeds throughout the month of April were normally distributed with a mean of 17 mph and a standard deviation of 4 mph. What is the probability that a day had a wind speed of no more than 21 mph?

• 50 % 
• 15.9 % 
• 97.7 % 
• 84.1% 

The wind speeds throughout the month of April were normally distributed with a mean of 17 mph and a standard deviation of 4 mph.  Approximately how many days had wind speeds between 17 and 25 mph? 

• 17 Days 
• 14 Days 
• 15 Days 
• 10 Days 

The odss of winning a game at the carnival are 3 in 7.  If Liza plays the game nine times, what is the probability that she wins exactly two times?  

• 13.15% 
• 3.12 % 
• 10.84 % 
• 8.23 % 

When Sophia's mom picks her up from school, she is late one third of the time.  For the next 15 days, what is the probability that she will be late at most three days?  

• 79.08 % 
• 79.31 % 
• 20.69 % 
• 20.92 % 

When Tom plays darts, he hits the target 65% of the time.  Find the probability that he hits the target at least four out of the next six attempts. 

• 57.17 % 
• 64.71 % 
• 42.83 % 
• 35.29 % 

What is the fourth term in the binomial expansion of (2x-y)⁷

• 280x³y⁴
• 560x⁴y³
• -280x³y⁴
• -560x⁴y³

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