AIR MATH

Math Question

The amount of daily time that teenagers spend on a brand A cell phone is normally distributed with a given mean \( \mu=2.5 \) \( \mathrm{hr} \) and standard deviation \( \sigma=0.6 \mathrm{hr} \). What percentage of the teenagers spend more than \( 3.1 \mathrm{hr} \) ? \( 5 \% \) \( 10 \% \) \( 16 \% \) \( 32 \% \)

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