0
What is th standard deviation of 72 68 64 90 80 84 78 75 76 77?
Wiki User
∙ 10y ago
For 72 68 64 90 80 84 78 75 76 77: σ=7.4863
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
When Mrs Myles gave a test the scores were normally distributed with a mean of 72 and a standard deviation of 8 About 68 percent of her students scored between which two scores?
68 % is about one standard deviation - so there score would be between 64 and 80 (72 +/- 8)
What is the standard deviation for the following numbers 100 76 68 80 56 64 72 52 84 40 60 72 56 64 36 52 76 44 60 80 56 48 68 76 84?
75.5 approx.75.5 approx.75.5 approx.75.5 approx.
What is the mean mode median of 64 64 64 65 65 65 65 67 67 68 68 70 70 72 73 76 79 80?
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 con?
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?
What is the range median mode mean of 72 93 57 72 46 68?
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
When Mrs Myles gave a test the scores were normally distributed with a mean of 72 and a standard deviation of 8 About 68 percent of her students scored between which two scores?
68 % is about one standard deviation - so there score would be between 64 and 80 (72 +/- 8)
What is the standard deviation for the following numbers 100 76 68 80 56 64 72 52 84 40 60 72 56 64 36 52 76 44 60 80 56 48 68 76 84?
75.5 approx.75.5 approx.75.5 approx.75.5 approx.
How do you calculate the varience?
find varience fo rthis numbers 71, 67, 70, 59, 71, 68, 67, 71, 80, 68, 74, 69, 72, 68.
What is the median of 61 62 64 68 70 71 72?
It is 68, the number in the middle when they are arranged in order.
What is the mean absolute deviation of 63 59 61 67 68 72?
It is 4.It is 4.It is 4.It is 4.
All the even numbers between 61 and 73?
62 64 66 68 70 72
What are the multiples of 4 in between 50 and 80?
52, 56, 60, 64, 68, 72, 76.
Data A 77 64 71 55 72 73 71 47 52 Data 40 25 26 12 2 46 22 23 28 34 which one what data sets shows more variatiion around the mean?
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
Multiples of 4 between 40 and 80?
They are: 44, 48, 52, 56, 60, 64, 68, 72, 76.
What is the ratio 72 to 64?
It is 72/64 = 1.125
What is 72 - 64?
8
What is the greatest common factor of 68 and 72?
GCF(68, 72) = 4.
