The temperatures (in °F) in a city on randomly selected days during the summer are 89, 85, 90, 87, 86, 91, 88, and 89. What is the mean temperature? Round your answer to one decimal place.
I'm sorry about that! Let me try again.
To find the mean temperature, we add up all the temperatures and divide by the total number of temperatures:
89 + 85 + 90 + 87 + 86 + 91 + 88 + 89 = 705
There are 8 temperatures, so we divide the sum by 8:
705 / 8 = 88.125
Rounded to one decimal place, the mean temperature is 88.1°F.
To find the median temperature, we need to first put the temperatures in order from lowest to highest:
-11°, -9°, -9°, -8°, -3°, 1°, 2°
There are seven temperatures, so the median is the middle temperature. In this case, the middle temperature is -8° because it is the fourth temperature in the ordered list.
Therefore, the median low temperature for that week was -8°F.
I'm sorry about that, let me try again.
To find the median age, we need to count the number of ages we have from the stem-and-leaf plot, which is 8. Since there are an even number of ages, the median is the average of the two middle values when sorted in ascending or descending order.
Writing the ages out in ascending order, we have:
28, 31, 32, 34, 42, 47, 49, 54
The two middle values are 34 and 42, so the median age is:
(34 + 42) / 2 = 38
Therefore, the median age is 38 years.
incorrect
The low temperatures during one week in January were 2°, −3°, −9°, −11°, 1°, −8°, and −9°. What was the median low temperature that week?
The stem-and-leaf plot shows the ages of a group of friends. Find the median age.
Stem Leaf
2 8
3 1 2 4
4 2 7 9
5 4
Key: 2|8=28 years
incorrect
Here are the math test scores of 10 randomly selected students from Class 1 and Class 2.
Class 1: 75 80 84 79 92 86 88 86 86 90
Class 2: 83 85 91 93 72 85 76 80 82 89
Find the mean score of each sample. Based on the mean, which class generally performed better on the math test?
To find the mean score of each sample, we need to add up all the scores and divide by the number of scores.
For Class 1:
(75 + 80 + 84 + 79 + 92 + 86 + 88 + 86 + 86 + 90) / 10 = 84
The mean score for Class 1 is 84.
For Class 2:
(83 + 85 + 91 + 93 + 72 + 85 + 76 + 80 + 82 + 89) / 10 = 83.6
The mean score for Class 2 is 83.6.
Comparing the mean scores, we can see that Class 1 has a higher mean score than Class 2. Therefore, based on the mean, Class 1 generally performed better on the math test.