68 % is about one standard deviation - so there score would be between 64 and 80 (72 +/- 8)
75.5 approx.75.5 approx.75.5 approx.75.5 approx.
64 64 64 65 65 65 65 67 67 68 68 70 70 72 73 76 79 80. NB Place the numbers in RANK order. In this case it is already done #1 MODE ; is the term that occurs most frequently. In this case it is '65' , as there are four lots of '65' #2 MEDIAN ; is the term that occurs at the ABSOLUTE middle of the ranked order. Since there are eighteen terms, there is no absolute middle term. So we take the two middle terms that have the same number of terms to their side, that is terms nine & ten. They are 67 & 68. We then add these two together and halve the result. Hence (67 + 68) / 2 = 67.5. This is the median term. #3 MEAN ; is the sum of all the terms, which is the divided by the number of terms. Hence (64+64+64+65+65+65+65+67+67+68+68+70+70+72+73+76+79+80)/18 = 69' NB Another way of calculating the mean is ((3x64)+(4x65)+(2x67)+(2x68)+(2x70)+72+73+76+79+80)/18 = 69 NNB The word 'average' is casually used in the non-mathematical world, but the correct term is MEAN.
Suppose a normal random variable has a mean of 72 inches and a standard deviation of 2 inches. Suppose the random variable X measures the height of adult males in a certain city. One may therefore conclude that approximately 84% of the men in this population are shorter than?
First of all place the numbers in rank order. Hence 46,57,68,72,72,93. RANGE; is the difference between the highest and lowest numbers, which is 93-46 = 47 MEDIAN: is the absolute mid-point. Since there is no absolute mid-point, we take the two middle numbers , add them and divide by '2'. Hence. ( 68+72)/2 = 70 MODE: is the term that occurs most frequently. In this case '72'. as there are two of them , but only one each of the other terms. MEAN; Add all the terms and divide by the number of terms. (46+57+68+72+72+93) / 6 = 408/6 = 68
68 % is about one standard deviation - so there score would be between 64 and 80 (72 +/- 8)
75.5 approx.75.5 approx.75.5 approx.75.5 approx.
find varience fo rthis numbers 71, 67, 70, 59, 71, 68, 67, 71, 80, 68, 74, 69, 72, 68.
It is 68, the number in the middle when they are arranged in order.
It is 4.It is 4.It is 4.It is 4.
62 64 66 68 70 72
52, 56, 60, 64, 68, 72, 76.
Compute the variance (or its square root , standard deviation) of each of the data set. Set 1: standard deviation = 10.121 Set 2: standard deviation = 12.09 Set 2 shows more variation around the mean. Check the link below
They are: 44, 48, 52, 56, 60, 64, 68, 72, 76.
It is 72/64 = 1.125
8
they fall into groups,64 and 65 are the same.66 and67 are like each other but different from 64-5.then you have 68-72.