Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6).
378, 361, 350, 375, 200, 391, 375, 368, 321

-What is the standard deviation?
A)342.43
B)3424.3
C)58.5
D)191
E)10609

Question

Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6).
378, 361, 350, 375, 200, 391, 375, 368, 321

-What is the standard deviation?
A)342.43
B)3424.3
C)58.5
D)191
E)10609

Quizplus · Accepted Answer

The standard deviation measures the amount of variability or dispersion of a set of data values. It is typically represented by the symbol sigma (σ) and is calculated using a formula that takes into account how far each data point is from the mean of the entire set. The resulting value gives us an idea of how spread out the data is from the central tendency. In this case, the standard deviation is given as 58.5, which means that the data values are relatively close to the mean.

Quality Control Is an Important Issue at ACME Company Which