Random
#17 Construct the classes for this data set (Width of 10):
12 24 37 49 53 42 14 42 36 28 48 32 13 51 11 22 39 56 16 21 45
Classes: 10-19, 20-29, 30-39, 40-49, 50-59
#13 What is the range for this data set?
82 101 120 63 87 59 113 103 79 98 118
61
#9 (True/False) The total relative frequency always equals 1.
True
#5 If a problem says p=0.5324, what is this converted into for percentage?
53.24%
#1 Data Set:
12 34 15 23 30 35 19
What is the mean?
24
#18 Data Set:
12 34 15 23 30 35 19
What is the median?
23
#14 Data Set:
11 23 35 20 23 35 22 31 23 12 11
What is the mode?
23
#10 Draw out the sample mean and the sample proportion (the symbols)
Mue and MueP
#6 Determine the mean and standard deviation of the variable X for the following binomial distributions: N = 4 and pie = 0.10.
Mean: 0.4
Standard Deviation: 0.6
#2 Please construct a quartile diagram with this information (#)
Q1 = 27838
Q2 = 34543
Q3 = 38628
#19 Compute the Z Scores for this data set. Are there any outliers? Why?: (The standard deviation = 7.874)
-8 -5 7 9
1) -1.27
2) -0.89
3) 0.64
4) 0.89
#15 The weight of an energy bar is approximately normally distributed with a mean of 42.05 grams with a standard deviation of 0.025 gram. If a sample of 4 energy bars is selected, what is the probability that the sample mean weight is less than 42.035 grams?
0.1151
#11 Toby’s Trucking Company determined that the distance traveled per truck per year is normally distributed, with a mean of 50 thousand miles and a standard deviation of 12 thousand miles. What proportion of trucks can be expected to travel between 34 and 50 thousand miles in a year?
0.4082
#7 A random sample of 50 households was selected for a phone (landline and cellphone) survey. The key question asked was, “Do you or any member of your household own an Apple product (iPhone, iPod, iPad, or Mac computer)?” Of the 50 respondents, 20 said yes and 30 said no. If the population proportion is 0.45, determine the standard error of the proportion.
0.0704
#3 The United States Population average heart rates for all 50-year-old women is 120. The standard deviation is 7.8. One woman is randomly selected from the normally distributed population. What heart rate represents the middle 68% of the distribution?
127.72 and 112.28
#20 A survey reports that 60% of plants (p=0.60) grow faster with a new soil that has been tested in a lab. If a sample of 9 plants is taken, what is the probability that 4 or more will grow faster? [Probability (x >= 4)]
0.9006
#16 A survey reports that 40% of students (p=0.40) want to change their majors. If a sample of 14 students is taken, what is the probability that exactly 6 will report that they want to change their major?
0.2066
#12 Find the relative frequency in the frequency distribution table:
#8 Find the cumulative frequency and the cumulative relative frequency in the frequency distribution table:
yay
#4 36% of former college students have student debt. If 12 former college students are selected, find the probability that between 3 and 7 of them have student debt?
0.8344