Statistics

Construct a histogram that represents the following data regarding the students' scores on a recent exam for a Statistics class. Class Frequency 53.5 62.4 5 62.5 71.4 10 71.5 80.4 3 80.5 89.4 5 89.5 98.4 9

Find the lower class boundary for the third class. 71.4 + 71.5=142.9 divided by 2= 71.45 Find the upper class boundary for the fourth class. 89.4+89.5=178.9 divided by 2=89.45

Price of Refrigerators (in Dollars) Class Frequency Class Boundaries Midpoint Relative Frequency Cumulative Frequency 1196-1245 1246-1295 1296-1345 1346-1395 1396-1445 1446-1495

Identify the midpoint of the first class. Answer 1196+1245 divided by 2 answers 1220.5

Price of Laptop Computers (in Dollars) Class Frequency Class Boundaries Midpoint Relative Frequency Cumulative Frequency 1000-1059 1060-1119 1120-1179 1180-1239 1240-1299 1300-1359

Step 1 of 7 : Determine the class width of the classes listed in the frequency table. 1359-1000=359 divided by 6=59.83 round it up to 60.

The population mean

The population mean is the arithmetic mean of all the values in a population, given by μ=x1+x2+...+xN --------------- N =∑xi ------- N where xi is the i th data value in the population and N is the number of values in the population.

Consider the following data representing the price of refrigerators (in dollars). 1459, 1381, 1347, 1485, 1473, 1479, 1306, 1221, 1402, 1366, 1205, 1431, 1427, 1490, 1209, 1260, 1296, 1204, 1487, 1343, 1358 Determine the frequency of the first class. answer is 2.

Understanding that the frequency of a given class is the number of data values in that class. Identifying all the values that belong to the third class. Correctly entering the frequency for the proper class. Determine the lower class boundary for the third class. 1295.5

Consider the following frequency table representing the scores on a test. Scores on a Test Class Frequency 30-39 9 40-49 13 50-59 12 60-69 8 70-79 6 Step 3 of 5 : Determine the class width of each class.

40-30=10

Students were surveyed to find out the number of hours they sleep per night during the semester. Here is a sample of their self-reported responses. Calculate the mean. 5, 6, 8, 10, 4, 6, 9

5+6+8+10+4+6+9=48 48 DIVIDED BY 7=6.857143 ≈6.9

Consider the following data. 7,−5,7,−5,7,−5,−6 Determine the mean of the given data.

7+(-5)+7+(-5)+7+(-5)+(-6)=0 0/7=0

Rutherford downloaded five new songs from the Internet. He knows that, on average (mean), the songs cost $1.23. If four of the songs cost $1.29 each, what was the price of the fifth song he downloaded?

the cost of Rutherford's fifth song was $0.99.

Stem Leaves 9 1 4 4 6 8 10 0 1 7 9 11 0 0 2 12 3 4 4 5 5 5 6 13 4 4 5 6 9 14 3 6 8 15 4 5 9 9 16 1 2 5 6 8 9 17 5 6 6 8

what is the weight of the lightest person in the group? 91 How many people weigh in the range from 120 to 150 inclusive? 15 What is the weight of the heaviest person in the range 160 to 169 inclusive? 169