# Quiz document | Mathematics homework help

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1.  Evaluate   (probability of success in a Bernoulli trial) for the following values:

n = 10    x = 2    p = 0.6

Answer:  P(2) =  ___________________________

2. – 3.  The following full IQ scores were obtained by testing a group of children who live near a lead smelter and are exposed to high concentrations of lead in the environment:

 82 93 85 75 85 80 101 89 80 94 88 104 88 83 104 96 76 80 79 75

2.  Complete the following frequency table:

 IQ Interval Frequency Relative Frequency 67.5 – 72.5 72.5 – 77.5 77.5 – 82.5 82.5 – 87.5 87.5 – 92.5 92.5 – 97.5 97.5 – 102.5 102.5 – 107.5 107.5 – 112.5

3.  Using the UNGROUPED sample data, find the mean; median; and mode(s), if any:

Answers:  Mean ______________  Median  _________________   Mode ___________

4. – 5.  A social psychologist gave a survey to 8 active members of a small political action group about how many hours they put into the group’s activities each week. The results were as follows: 41, 24, 44, 33, 40, 41, 19, and 30.

4.  Compute the sample mean, median, and mode

Answers:  Mean ______________  Median  _________________   Mode ___________

5.  Compute the sample variance and sample standard deviation.

Answers:  Variance  ___________________  Standard Deviation  __________________

6. – 7.  A study of blood cholesterol levels using samples from 80 participants provided the following data:

 Blood Cholesterol Level (mg/dl)(Interval) Frequency 149.5 – 169.5 4 169.5 – 189.5 11 189.5 – 209.5 15 209.5 – 229.5 25 229.5 – 249.5 13 249.5 – 269.5 7 269.5 – 289.5 3 289.5 – 309.5 2

6.  Compute the mean and median:

Answers:  Mean ______________  Median  _________________

7.  Compute sample standard deviation.

Answer:  Standard Deviation  __________________________

8.  Identify the graphics presented below (enter letter of choice which best describes graph type):

_________                                   __________                                   __________

Choices:          a.  broken line graph                c.  double bar graph                e.  ogive                                               b.  histogram                           d.  divided bar graph              f.  pie graph

9.  One of the initial clinical trials of the anti-math anxiety drug SHOVITALL™ tested for the presence of headaches as a side effect.  In the trial, 450 subjects were treated with 80mg of the drug, and 2.2% of the subjects developed headaches.  In the binomial distribution of these 450 subjects, what are the mean and standard deviation?   Use p = 0.022

Answers:  Mean = _______________  Standard Deviation = _________________

10.  Multiple Choice:  According to the American Chemical Society, there is a 0.9 probability that in the United States, a single randomly selected \$1 dollar bill is tainted with traces of cocaine.  Assume eight \$1 dollar bills are randomly selected.  What is the probability that six (6) or more of the \$1 dollar bills randomly selected will be tainted with traces of cocaine?

A.    P (≥ 6) =  0.962                                         C.   P (≥ 6) =  0.149

B.     P (≥ 6) =  0.750                                         D.   P (≥ 6) =  0.813

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