esearch shows that the average age when males first begin using social media is µ = 12.91 years, with a standard deviation of σ = 2.34 years. Assuming that the distribution of ages is approximately normal, answer the following questions: a) What proportion of male social media users began before the age of 10? That is, what is p(X < 10)? p(X < 10) = b) How young would someone have to be in the top 5% of earliest users? That is, what is the value of X such that p(X) < 0.05? (Hint: keep in mind whether the Z-score should be positive or negative.) How young would someone have to be in the top 5% of earliest users? That is, what is the value of X such that p(X) < 0.05? (Hint: keep in mind whether the Z-score should be positive or negative.) a.16.77 years b.9.05 years c.12.79 years d.1.65 years
Research shows that the average age when males first begin using social media is µ = 12.91 years, with a standard deviation of σ = 2.34 years. Assuming that the distribution of ages is approximately normal, answer the following questions:
a) What proportion of male social media users began before the age of 10? That is, what is p(X < 10)? p(X < 10) =
b)
How young would someone have to be in the top 5% of earliest users? That is, what is the value of X such that p(X) < 0.05? (Hint: keep in mind whether the Z-score should be positive or negative.)
How young would someone have to be in the top 5% of earliest users? That is, what is the value of X such that p(X) < 0.05? (Hint: keep in mind whether the Z-score should be positive or negative.)
a.16.77 years
b.9.05 years
c.12.79 years
d.1.65 years
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