The temperatures in St. Louis for the last week were: 95, 94, 94, 95, 96, 86, 90.
If we calculate the high temperature for today using 3-day moving average then,
1st 3 day moving average = {(95+94+94)/3} [Taking the first 3 values]
= 94.34
2nd 3 day moving average = {(94+94+95)/3} [Taking the second 3 values]
= 94.34
3rd 3 day moving average = {(94+95+96)/3}
= 95
4th 3 day moving average = {(95+96+86)/3}
= 92.34
5th 3 day moving average = {(96+86+90)/3}
= 90.67
We can see that the 2 day moving averages are 94.34, 94.34, 95, 92.34, 90.67 so we cannot say that the trend is increasing or decreasing so the temperature may rise or fall.
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