Can someone help me to describe this question..?

Question

Machines A (Mean=24.83 mm, Mode=25 mm, Median=24.92 mm)

Machine B (Mean=26.23 mm, Mode=27 mm, Median=26.32 mm)

a) Make a comparison between A and B
b) What further information do you need?
c) How reliable are the results which have been obtained?

Answer 1

Mean ... is the average of the series of numbers
Mode ....is the frequency of one of the occuring numbers in the series
Median ...is the middle point between the highest and lowest

a) You would need to look at the comparisson of the mean to the median. This would show how the average differs from the middle point of the series. This would tell you how the numbers are distributed.

b) It would be useful to know the range, the step.

hope others will contribute to correct me if I'm wrong and are more able to help you than I have so far, good luck.

Answer 2

"The law of averages" is often used as a colloquial expression - as in "Well, I haven't had a best answer yet today, but I've answered 10 questions and by the law of averages I have to have one soon!"

And in that context, it's not really meaningful.

In mathematics, on the other hand, there are 3 types of 'average' - mean, median and mode.

Mean is what everyone else here has been describing - sum all the numbers in a set and divide by the number of items in the set.

Median is the number in the middle - it's the number that has at most half the other numbers above it and at most half below it ("at most" because it might be one of the numbers itself)

Mode is the number with the most items equal to it.

For example - take a set of numbers 1,1,1,1,2,2,2,4,5,7.

Mean = 2.6 ((1+1+1+1+2+2+2+4+5+7)/10)

Median = 2 (1,1,1,1,2 below it; 2,4,5,7 above)

Mode = 1 (four one's, less of everything else)

They can all be useful - if you're told the average (mean) salary at a company is £20,000, for example, that doesn't sound too bad; but if 9 employees earn £10,000 and the boss earns £110,000, that's rubbish! Either the median or the mode would give the game away here - they're both £10,000.

Answer 3

try putting: statistics +compare mean and look at the options. since yahoo does not permit "re-directing to a non yahoo site" i can't post the URL, but try the one with a PowerPoint presentation.
you will need to find the standard deviation and test a hypothesis (hypothosys.. hipopotamus.... sorry, can't spell!) probably using a t-test.
good luck

Answer 4

Never was any good at this kind of maths

Answer 5

B. It wins hands down. Because it's bigger.

Answer 6

hmmmm! complete bollox?

Answer 7

difficult

Answer 8

uhhhhhhhhhhhh!!!

Answer 9

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