Find the standard deviation of the sample data set 127 135 128 131-133 127 122

The standard deviation of the sample data set is 4.36

Step-by-step explanation:

* Lets explain how to find the standard deviation

# Step 1: find the mean of the data set

∵ The mean = the sum of the data ÷ the number of the data

∵ The data set is 122 , 127 , 127 , 128 , 131 , 133 , 135

∵ Their sum = 122 + 127 + 127 + 128 + 131 + 133 + 135 = 903

∵ They are seven  

∴ The mean = 903 ÷ 7 = 13.29

# Step 2: subtract the mean from each data and square the answer

∴ (122 - 129)² = 49

∴ (127 - 129)² = 4

∴ (127 - 129)² = 4

∴ (128 - 129)² = 1

∴ (131 - 129)² = 4

∴ (133 - 129)² = 16

∴ (135 - 129)² = 36

# Step 3: find the mean of these squared difference

∵ The data is a sample data set

∵ The mean = the sum of the data ÷ (the number of the data - 1)

∵ The sum = 49 + 4 + 4 + 1 + 4 + 16 + 36 = 114

∴ The mean = 114 ÷ (7 - 1) = 114 ÷ 6 = 19

# Step 4: the standard deviation is the square root of this mean

∴ The standard deviation = √(19) = 4.3589 ≅ 4.36

* The standard deviation of the sample data set is 4.36

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points

step-by-step explanation:

most likely the answer is a.

alice wins if a total of 5 is rolled. finn wins if a total of 9 is rolled.