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Senior | Next Rank: 100 Posts
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by sumasajja » Sat Jul 23, 2011 8:43 am
number of lawn mowers
monday 752
tuesday 747
wednesday 755
thursday 754
friday

the table above shows the number of lawn mowers produced by company l each workday last week except friday.if company l produces an average (arithematic mean of 750 lawn mowers per day for the work week ,how many lawn mowers did it produce on friday?
a]736
b]739
c]742
d]750
e]758
the answer is [spoiler]c
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by knight247 » Sat Jul 23, 2011 8:59 am
(Sum of the # of lawn movers produced every day of the work week)/total number of working days=Average # of lawn movers produced per day for the work week

(752+747+755+754+Friday)/5=750

(752+747+755+754+Friday)= 3750
3008+Friday=3750
Friday=742 Hence C
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by goalevan » Sat Jul 23, 2011 9:24 am
You can also track the residuals to find the remaining observation.

The average is 750, so

752 - 750 = 2
747 - 750 = -3
755 - 750 = 5
754 - 750 = 4

The sum of the first four residuals is 2 + (-3) + 5 + 4 = 8, so the final one must be -8 to bring the mean to 750.

750 + (-8) = 742.
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