Use the information and table below to answer the question:

Over the last months years since Fred has been using the Little Dog mower, he has been carefully noting how long it takes him to mow the yard. He collected the following data:

Image text file: Mowing and Trimming spreadsheet data.rtf

Question: Based on the data from Freds record keeping, which of the following is true:

		Freds process reveals performance that varies a lot with it sometimes taking him 68.4 minutes longer to mow the yard and/or 28.7 minutes longer to trim it.
		Freds process reveals that 1 standard deviation for mowing is not quite 3 minutes and for trimming, about 2 minutes
		Fred could likely mow the yard in less than half an hour if he really hurried.
		Fred always takes at least 21 minutes to trim the yard.