What should be the value of the standard deviation? like what's a good standard deviation?

for an approximate answer, estimate your coefficient of variation (cv=standard deviation / mean).as a rule of thumb, a cv > = 1 indicates a relatively high variation, while a cv < 1 can be considered low. this means that distributions with a coefficient of variation higher than 1 are considered to be high variance whereas those with a cv lower than 1 are considered to be low-variance.

remember,   standard deviations aren't "good" or "bad". they are indicators of how spread out your data is. a "good" sd depends if you expect your distribution to be centered or spread out around the mean. this really depends on your data.

step-by-step explanation:

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or