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# Texting: A sample of 300 teenagers are selected at random: Let X be the number of teenagers who have sent text messages on their cell phones within the past 30 days...

## Question

###### Texting: A sample of 300 teenagers are selected at random: Let X be the number of teenagers who have sent text messages on their cell phones within the past 30 days According to study by the Nielsen Company; the probability distribution of X is as follows:P(X)0.050.100.250.370.23Questions:a) What is the variable in this data? Be specific. (2pts) b) Compute the probability (in decimal form rounded to 2 decimal places) that:three teenagers sent text messagesthree or more of the teenagers sent text

Texting: A sample of 300 teenagers are selected at random: Let X be the number of teenagers who have sent text messages on their cell phones within the past 30 days According to study by the Nielsen Company; the probability distribution of X is as follows: P(X) 0.05 0.10 0.25 0.37 0.23 Questions: a) What is the variable in this data? Be specific. (2pts) b) Compute the probability (in decimal form rounded to 2 decimal places) that: three teenagers sent text messages three or more of the teenagers sent text messages fewer than two of the teenagers sent text messages anywhere from 2 to 4 teenagers sent text messages Compute P(z > 2)- d) Compute P (1 < X < 3) and explain what the result represents. Compute the mean and interpret the result: No need of showing your work f) Compute the standard deviation, Ox _ Round to 2 decimal places Work is not needed Extra Credit: g) Of the 300 teenagers surveyed how many teenagers have sent 2 text messages on their cell phones within the past 30 days. h) Of the 300 teenagers surveyed how many teenagers have sent anywhere from 1 to 3 text messages on their cell phones within the past 30 days.

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