Reference no: EM132464890

1) Find the mean of the data summarized in the given frequency distribution. Round to one decimal place as needed.

Speed (miles per hour) Frequency

42-45 23

46-49 14

50-53 6

54-57 3

58-61 2

The mean of the frequency distribution is: 

2) One common system for computing a grade point average (GPA) assigns 4 points to an A, 3 points to a B, 2 points to a C, 1 point to a D, and 0 point to an F. What is the GPA of a student who gets an A in a 3-unit course, a B in each of three 4-unit courses, a C in a 3-unit course, and a D in a 4-unit course? Round to 2 decimal places.

GPA = 

Five pulse rates are randomly selected from a set of measurements. The five pulse rates have mean of 73.8 beats per minute. Four of the pulse rates are 92, 79, 89, and 50. Find the missing value.

3) Use the formula to find the sample variance and sample standard deviation for the following data set

25 , 23 , 17 , 16 , 30

Step 1: Find the mean. 

μ =

Step 2: Fill in the table

x x - μ (x - μ)²

15

16

20

26

32

Step 3: Population variance = σ² = 

Step 4: Population standard deviation = σ = 

(Round the standard deviation to 4 decimal places as needed)