# Question: Average talk time between charges of a cell phone is

Average talk time between charges of a cell phone is advertised as 4 hours. Assume that talk time is normally distributed with a standard deviation of 0.8 hour.

a. Find the probability that talk time between charges for a randomly selected cell phone is below 3.5 hours.

b. Find the probability that talk time between charges for a randomly selected cell phone is either more than 4.5 hours or below 3.5 hours.

c. Twenty five percent of the time, talk time between charges is below the 1st quartile value. What is this value?

a. Find the probability that talk time between charges for a randomly selected cell phone is below 3.5 hours.

b. Find the probability that talk time between charges for a randomly selected cell phone is either more than 4.5 hours or below 3.5 hours.

c. Twenty five percent of the time, talk time between charges is below the 1st quartile value. What is this value?

**View Solution:**## Answer to relevant Questions

A young investment manager tells his client that the probability of making a positive return with his suggested portfolio is 90%. If it is known that returns are normally distributed with a mean of 5.6%, what is the risk, ...While Massachusetts is no California when it comes to sun, the solar energy industry is lourishing in this state (The Boston Globe, May 27, 2012). The state's capital, Boston, averages 211.7 sunny days per year. Assume that ...Let X be exponentially distributed with ยต = 1.25. In addition to providing the answer, state the relevant Excel commands.a. P(XA florist makes deliveries between 1:00 pm and 5:00 pm daily. Assume delivery times follow the continuous uniform distribution. a. Calculate the mean and the variance of this distribution. b. Determine the percentage of ...Suppose that the annual household income in a small mid western community is normally distributed with a mean of $55,000 and a standard deviation of $4,500. In addition to providing the answer, state the relevant Excel ...Post your question