Respuesta :
The standard deviation is a measure of a collection of values' variance or dispersion. The correct option is B.
What is a standard deviation?
The standard deviation is a measure of a collection of values' variance or dispersion. A low standard deviation implies that the values are close to the set's mean, whereas a high standard deviation shows that the values are spread out over a larger range.
For the last summer,
Mean = (140 + 220 + 190 + 180 + 190) / 5 = 920/5 = 184
[tex]\sigma={\sqrt {\dfrac{(140-184)^2+ (220-184)^2+(190-184)^2+(180-184)^2+(190-184)^2}{5}}}\\\\\sigma = 25.7682[/tex]
For this summer,
Mean = (150 + 170 + 150 + 190 + 180) / 5 = 840/5 = 168
[tex]\sigma={\sqrt {\dfrac{(150-168)^2+ (170-168)^2+(150-168)^2+(190-168)^2+(180-168)^2}{5}}}\\\\\sigma = 16[/tex]
Hence, The number of pages in each book varied more last summer than this summer. Thus, the correct option is B.
Learn more about Standard Deviation:
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