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It is the variance in time between each heartbeat. ECG, and blood pressure tests are often used to measure the variance in the rhythm of the heart.
perturbation.
Favourable variance is that variance which is good for business while unfavourable variance is bad for business
Negative price variance is when the cost is less than budgeted.
Volume variance is a variance in the volume produce.
efficiency variance, spending variance, production volume variance, variable and fixed components