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igor_vitrenko [27]
2 years ago
12

Justin did push-ups for the past 555 days.The following data points are the number of push-ups he did each day.

Mathematics
1 answer:
Vitek1552 [10]2 years ago
3 0

Answer: σ: 2.76

Step-by-step explanation:

Count, N: 5

Sum, Σx: 125

Mean, μ: 25

Variance, σ2:  7.6

Steps

look at attached pic for formula

σ^2 = \frac{Σ(xi - μ)^{2} }{N}

\frac{(21 - 25)2 + ... + (29 - 25)2}{5}

⇒ \frac{38}{5}

⇒ 7.6

σ =  \sqrt{7.6}

⇒   2.756809750418

⇒ or 2.76

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