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Te Jverare daily Ueetwo ternperature 'terrperatures? ata certain location 'ranges fromn 11SFF on the coldest dayin inier 1o f 28Fonthe Yarmesx day In sunm...

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Te Jverare daily Ueetwo ternperature 'terrperatures? ata certain location 'ranges fromn 11SFF on the coldest dayin inier 1o f 28Fonthe Yarmesx day In sunme 8 10 # 0

Te Jverare daily Ueetwo ternperature 'terrperatures? ata certain location 'ranges fromn 11SFF on the coldest dayin inier 1o f 28Fonthe Yarmesx day In sunme 8 10 # 0



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In Boardman City, the daily low temperatures, in degrees Fahrenheit $\left({ }^{\circ} \mathrm{F}\right),$ during the first week in January were $-13,-8,10,2,23,31,$ and 30. To the nearest $1^{\circ} \mathrm{F}$, what was the mean daily low temperature for that week? A. -3 B. 10 C. 11 D. 18 E. 25

To find the average temperature for these seven days, I first need to add the numbers together. So to add those together, I have a mixture of positive and negative. One technique would be to add all the negatives together and at all the positives, and then subtract those. But when I adul seven numbers together, I get negative. 28. I have seven days, so I'm going to find the average of those seven days by dividing the total by the total number of days because they have one negative and one positive. My final answer is going to be negative, says I have different signs. My averages negative seven degrees would be the average daily low temperature for that week.

So here we have a formal effort. Degree days D equals absolute value of 65 minutes H with sell over two. And I chose to find some data for where I live in Oak Park, California but average day in January. So apparently on an average day, January the highest temperature is about 62 degrees ran high, and the lowest is 46. I live in Southern California is not very, very much about you. So first we have to substitute in 62. What age and 46 What help? So we get day equals 65 minus 62. Close 46 over to. So let's add 60 to plus 46 over here. So we get a get 108 So we have d equals have the value of 65 minus one of age over to. So that's the 108 Divided by two to those into 10 5 times. Two times five is 10 10 minus 10. It'll still bring down the eight. Two times four equals 88 minus eight equals. So So we have d equals 65 minus 54. No, that's C 65 minus 50 or he calls 11. And because 11 so very positive, never the absolute value doesn't do anything to us, so we get d equals below.

To find the average of these seven numbers I need to add first, the seven numbers we need to find the total or the some of those seven numbers. That sum is negative 28. So to find the average, I have seven days. I'm going to take that total, which is negative. 28. Divide that by the total number of days says I have one negative divided by one positive. My result is going to be a negative number, So my average daily high temperature for the week is negative four degrees.

We have the temperatures here uh in four different cities in Celsius and Fahrenheit here's the formula to convert from Celsius to Fahrenheit. So we can just convert the two Celsius temperatures. Um and then Compare all of them. So 9 5th times negative 10 Plus 32 is gonna be negative, 90/5. Just negative, 18 plus 32 Which is equal to 14° Fahrenheit for the negative 10 and then for 20 degrees Celsius, we have 9/5 so times 20 plus 32. So this is like nine times four, which is 36. Okay plus 32 is 68 which is just under room temperature, 60 F. So now we have them all in Fahrenheit and it's really easy to compare that this uh negative 10 Celsius there, 14. Fahrenheit is going to be the coldest, which corresponds to Montreal, and then the warmest is going to be the 68 F or 20 degrees Celsius. And that corresponds to charlotte, which makes sense relative to how north and south. Each of these cities are


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