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hmm see if i remember this First find the mean of all the values by adding up all the values then dividing by 10
the subtract the mean from each of the values so for 17 this will give 17-17.3 = -0.7 do this for all 10 values
I'll be honest I have no idea :(
why u choose 17?
just as an example
oh i see
then you square each of the results and add them up. Finally divide the total by n
i dont no what the or the upside down h is
where mu is the mean and Sigma means the total sum
the n is total number of readinsg = 10
thats the variance the standard deviation is the square root of the variabce
be careful with your computation
I'm relying in memory but i think this is right
maybe triciaal will confirm?
so far i got -0.3, 2.7, -5.3, -3.3, 0.7, 5.7,-0.3, 1.7, 0.7, -2.3
Ok so you square each one of these
0.09, 7.29 etc
now add them up then divide by 10
0.09, 7.29, 28.09, 10.89, 0.49, 32.49, 0.09, 2.89, 0.49, 5, 29
look s good
@welshfella your process is fine, formula is correct, great job I was referring to the simple stuff 17 - 17.3 not = -0.7
i got 9,807? wait did i do that wrong
@jordanawest22 did you actually find the mean?
i subtracted everythin from 17.3...ex)17-17.3....then i added them and divided by 10 and got , 8.807
no after you subtract you square each then add before dividing by N
what?, but the answer is up there??????
i'm getting a bit confused myself!!!!! its value - mean right?
thats what i did
so the first 1 is 17-17.3 = -0.3
for the X each entry in the data here I have 1,2,3,4,5,
i found the mean of the numberss in the question then i subtrated the mean by all of the units in the problem, i got mostly decimals...then i squared them all then added them then divided by 10
yes thats correct - - i think its best to put it in a table as triciall has then you are less likely to make errors
ok, i got 8.81 so that would be the variance right?
i got 8.81 for the variance
and to find the variance i do what now?
8.81 is the variance std dev = square root of the variance
sqrt 8.81 = ?