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Mean - Problem 1
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
Sometimes I know parents can give you a lot of trouble about how much time you spend on the computer. Do your parents ever say to you get off the computer, go hit the ball or go outside blah, blah, blah? Well this is something, an idea you might use to talk with them about how much time you’re on the internet.
What I have here is the mean number of days that a person spent, mean number of minutes per day that a person spent on Facebook. On this day they spent 75 minutes that’s like a little more than an hour right? Because an hour would be 60 minutes. This day was like half an hour, 36 minutes, this day they never even got on Facebook, here was an hour and a half, that was like an hour. So you can see there is a range. It's like some days they spend more minutes than others. This day they never even got on the internet, maybe they were out of town or something.
Anyway we’ve got to find the mean. This is the key word mean. Remember the way to find mean is to add up all your values and then divide by how many they have. So grab a calculator. What I’m going to do is go in there and type in all of these numbers, add them up all together and you get 261. I did that before hand I kind of cheated. Once you add all of those you get 261 and we need to divide by how many values we have 1, 2, 3, 4, 5. This data set represents 5 days on the computer.
When you do that you see y our answer is 52.2 minutes. This person spends less than hour per day on Facebook, so if their parents were given them a hard time, they could say hey guys it’s less than an hour give me a break here because there are some days where this person is not at all. There’s other days where they’re on for an hour and a half, but usually it’s less than an hour.
Mean is a good way to describe usually. Usually I’m on Facebook for less than an hour. Again you add up all these numbers and then divide by 1, 2, 3, 4, 5, because we have 5 values.
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Sample Problems (3)
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Problem 1 4,436 views
Find the mean number of minutes per day spent on facebook: 75, 36, 0, 94, 56.
Problem 2 3,301 views
When finding a GPA, an "A" represents 4 points, a "B" is 3 points, "C" is 2 points, "D" is 1 point, and "F" is no points. What would the GPA be for a student who earned 4 B's, 2 C's and 1 D?
Problem 3 2,933 views
In history, your recent test scores are 95, 86, 78, 99, and 90. If you want your average to be 90, what do you need to get on your next test?