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Date: Wed Apr 21 2004 - 10:33:03 EDT
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"What is the range and what is the median of Lanny Chambers's first arrival dates for Ruby-throated hummingbirds in St. Louis? When do you think Lanny's first hummer will arrive in 2004?"
Between the years 1994 and 2003, the earliest arrival date of a hummingbird was April 16 and the latest was on April 23. The range of dates for sightings would be April 16-April 23, which would be seven days or a week. The earliest sightings took place in the years 2000 and 1998. The latest sighting was in the year 2003. To find the median, I put all the numbers in order from greatest to least: 16 16 17 19 19 19 20 20 22 23. I crossed the numbers out from each side and eventually ended up with 19 and 19.
Since the mean of 19 and 19 is 19, I got the date April 19th as the median.
I think that Lanny Chambersís first hummingbird arrival date will be on April 15. I have noticed that almost every the years 1998, 2000, and 2002 have earlier arrival dates then those of the odd years. Since there has been a trend of hummingbirds arriving earlier this year, I estimated the date to be on April 15th, 2004.
Julie Dang
Ms.Pfaff's 7th Grade Science Class
Challenger Middle School
San Diego, CA 92126
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