Area Under Normal Curve

Find the z value that corresponds to the given area.

Area=0.9671

(a)  

Note: You will see 2 variations of this question(1 of 2). Also, Use the Table given in class, Nspire solutions do not match

New-Home Prices If the average price of a new one-family home is $246,300 with a standard deviation of $15,000, find the minimum and maximum prices of the houses that a contractor will build to satisfy the middle 80% of the market. Assume that the variable is normally distributed.

Answer Minimum for this question

(a)  

Note: You will see 2 variations of this question(2 of 2). Also, Use the Table given in class, Nspire solutions do not match

New-Home Prices If the average price of a new one-family home is $246,300 with a standard deviation of $15,000, find the minimum and maximum prices of the houses that a contractor will build to satisfy the middle 80% of the market. Assume that the variable is normally distributed.

Answer Maximum for this question

(a)  

Note: Use the Table given in class, Nspire solutions do not match

Product Marketing An advertising company plans to market a product to low-income families. A study states that for a particular area, the average income per family is $24,596 and the standard deviation is $6256. If the company plans to target the bottom 18% of the families based on income, find the cutoff income. Assume the variable is normally distributed.

(a)  

Z-score of 2.5 on an IQ test is considered a genius (mean=100, SD=16). What score makes someone a genius? Hint: SOLVE for X

• 89.2

• 130

• 99.38

• 140

Mean=65 mph, SD=2 mph. What speed is the 95th percentile?

• 95 mph

• 68 mph

• 73 mph

• 69 mph

The 75th percentile is also know as the

• median
• third quartile
• 1st quartile`
• interquartile range

Pat and Tom took a test with mean 80 and SD 9. Pat scored a 76; Tom scored a 94. Find the percent of people between their scores.

• 68.78%

• 63.29%

• 65.14%

• 34.25%

Tags

CCSS.HSS.ID.A.4

CCSS.HSS.MD.A.1

Test has a mean of 40 and a standard deviation of 10. What is the percent of people that scored above 62?

• 1.39%

• 45.34%

• 98.41%

• 22.34%

Tags

CCSS.HSS.ID.A.4

The 75th percentile is also know as the

• median
• third quartile
• 1st quartile`
• interquartile range

Tags

CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.B.4

CCSS.6.SP.B.5