Answer:
In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean.
To calculate the standard deviation of those numbers:
Work out the Mean (the simple average of the numbers)
Then for each number: subtract the Mean and square the result.
Then work out the mean of those squared differences.
Take the square root of that and we are done!
Answer:
y = (7/4)x + 3
Step-by-step explanation:
(isolate the y variable by moving 7x) 4y = 7x + 12
(divide by 4 to get y by itself) y = (7/4)x + 3
Answer:
1.2 kg
Step-by-step explanation:
filling the jug up half way adds 1.4 kg to the weight.
2 x 1.4 - 2.8 kg of marbles when full
4-2.8 = 1.2 kg
Answer:
y = 2
Step-by-step explanation:
y varies inversely with x setup is:
y = k/x
7 = 
(find 'k')
k = 7/1 · 2/3
k = 14/3
use what you know about 'k' and 'x' to solve for 'y'
y = 14/3 ÷ 7/3 (remember to multiply by the reciprocal when dividing fractions)
y = 14/3 · 3/7
y = 2
