(1) Psychopathic Personality Disorder (psychopathy) is defined as a condition th
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(1) Psychopathic Personality Disorder (psychopathy) is defined as a condition that negatively affects one's level of empathy, conscience, and impulse control. A questionnaire was developed by Lilienfeld (1990) to asses one's level of psychopathy. Ninety random people were asked to take Lilienfeld's test. Their results are shown in the histogram below.
The maximum score is _____.
(2) In a statistics class with 136 students, the professor records how much money each student has in their possession during the first class of the semester. The histogram shown below represents the data he collected.
What is approximately the percentage of students with under $10 in their possession?
(3) A consumer agency is testing appliances for a series of articles in their magazine. Currently they are working with cooktops and ranges. They have selected 16 of the most commonly used models. Using a series of tests, the agency will estimate the lifetime of these models. A histogram of these (estimated) lifetimes is shown below.
What is the proportion of these appliances that is estimated to last longer than 15 years?
Mean -381.68 Std. Dev,-38.37 N=90 10 250.00 300.00 350.00 400.00 450.00 500.00 Total scoreExplanation / Answer
1) the maximum score = 450 + 50*2/3 = 483.33
2) percentage of students with under $10 in their possession = 61/136 = 44.85%
3) 15 years = 15*12 = 180 months
Proportional of these appliances that is estimated to last longer than 15 years = (3/5+2+1+1)/16 = 0.2875
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