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1aThere are approximately one billion smartphone users in the world today. In the United States, the...

1aThere are approximately one billion smartphone users in the world today. In the United States, the ages of smartphone users between 13 to 55 approximately follow a normal distribution with approximate mean and standard deviation of 37 years and 8 years, respectively.Using the 68-95-99.7 Rule, what percent of smartphone users are greater than 53 years old?

bThere are approximately one billion smartphone users in the world today. In the United States, the ages of smartphone users between 13 to 55 approximately follow a normal distribution with approximate mean and standard deviation of 37 years and 8 years, respectively. Using the 68-95-99.7 Rule, what percent of smartphone users are between 29 and 53 years old?

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Answer #1

Here we have given mean = 37 and standard deviation = 8 years. Here we have asked to use 68-95- 99.7 rule which is also known as Empirical rule.

om Mean 687 aceo w C37-, 37,P) 29,45) 951. atro wil ul jo 2 standard deviation form mcan Pence peccen oze 0.025 o.ans usces cratce ha0 53 yeacs olo 0-95 2 aec betscen 2g anol $3 hore to fined 53-3 29-37 29 :/(3% 2) -/o (グs-,) 0.9プチ2-0-158ヲ Hence ce betaren 2 and

Hope this will help you. Thank you. :)

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