Question

8) The following numbers represent quiz scores for 15 students. What is the mean score? (Enter your answer rounded to the tenths place, e.g. enter 8.3 instead of 8. Do not include units.) 4,5,5,6,7,7,7,8,8,8,9,9,9,9,10 Answer: For the distribution of quiz scores above, what is the median quiz score? Answer: 9) 10) Which of the following statements is always true? a). Half of the data is above the mean and half of the data is below the mean b). There are equal amounts of data above the mean and below the mean c). The total distance to points below the mean is the same as the total distance to points above the mean d). The sum of the distances of the data from the mean is never 0 11) Which of the following statements is always true? a). Half of the data is at or above the median value and half of the data is at or below the median value b). The median is halfway between the lowest value and the highest value c). The median value is halfway between the 1st and 3rd quartile marks Questions #11 and #12, use the dotplo,given below. Cereals 12) The dotplot shows the distribution of fiber (g/serving) for 25 children's breakfast cereals. What is the median amount of fiber for the cereals in this distribution? a). 0 g/serving 25 1 g/serving c). 1.5 g/serving d). 0.8 g/serving 5 13) The dotplot shows the distribution of fiber (g/serving) for 25 children's breakfast cereals. What is the mean amount of fiber for the cereals in this distribution? a). 0 g/serving Fiber (giserving) Circle Icon 1 g/serving c). 1.5 g/serving d). 0.8 g/serving target "child

Answer 1

8)

mean = sum of all terms / number of terms

= 111/15

= 7.4

9)

The median is the middle number in a sorted list of numbers. So, to find the median, we need to place the numbers in value order and find the middle number.

Ordering the data from least to greatest, we get:

4   5   5   6   7   7   7   8   8   8   9   9   9   9   10   

So, the median is 8 .

11)

median = 13th element when sorted

= 1

12)

x	f	p	xp
0	12	0.48	0
1	7	0.28	0.28
1.5	2	0.08	0.12
2	2	0.08	0.16
3	2	0.08	0.24
		mean	0.8