In a normal distribution, 99.7% of the data fall within how many standard deviations of the mean?
A. Two standard deviations
B. One standard deviation
C. It cannot be determined from the given information.
D. Three standard deviations

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answer:   14

step-by-step explanation:          

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42.4

step-by-step explanation:

convert to decimal

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°