Stats Review

A normal distribution of 126,000 test scores has a mean of 80 and a standard deviation of 7.5.  
Approximately what percentage of scores fall between 72.5 and 87.5?

• 2.5%
• 32.2%
• 16%
• 68.3%

Find the standard deviation of the data:
82 91 74 78 94 68 74 88 69 42 77 82 79 92 94 75 65 78 86 79 80 82

• 11.5
• 11.2
• 79.4
• 79

Find the median of the data
82 91 74 78 94 68 74 88 69 42 77 82 79 92 94 75 65 78 86 79 80 82

• 80
• 82
• 76
• 79

Find the mean of the data: 
82 91 74 78 94 68 74 88 69 42 77 82 79 92 94 75 65 78 86 79 80 82

• 88
• 79
• 82
• 76

Which is NOT a characteristic of normal distribution?

• Symmetrical/Bell Shaped
• Mean is at the center
• Random
• described by the mean and standard deviation

Between what two standard deviations of a normal distribution contain 68% of the data?

• one below and one above
• two below and two above
• two below and zero
• zero and two above

The z-score represents.....

• the amount of standard deviations a data value is above or below the mean.
• the percentile the data value is above or below the mean.
• the amount of standard deviations a data value is above or below the median.
• the percent the data value is above or below the mean.

The length of human pregnancies is approximately normal with a mean of 266 days and standard deviation of 16.  What percent of pregnancies last between 240 and 270 days?

• 45%
• 50%
• 55%
• 70%

Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Ervin's scores?

• 193
• 127
• 60
• 66

Tags

CCSS.6.NS.C.7

CCSS.6.SP.A.3

CCSS.6.SP.B.5

The number of miles that Kiki cycled each week for a 7-week period is shown: 
36, 42, 28, 52, 48, 36, 31 
What is the median number of miles Kiki cycled?

• 24
• 36
• 39
• 52

Tags

CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.B.5