# Question: According to Gartner Inc 39 2 of mobile phones worldwide use

According to Gartner, Inc., 39.2% of mobile phones worldwide use the Android operating system in 2013. A random sample of 30 mobile phone users was selected in 2013. Assuming this estimate is true, use the normal approximation to the binomial distribution to answer the following:

a. Calculate the mean and standard deviation for this distribution.

b. What is the probability that 13 or more of the 30 mobile phone users have an Android operating system?

c. What is the probability that exactly 14 of the 30 mobile phone users have an Android operating system?

d. What is the probability that 7, 8, or 9 of the 30 mobile phone users have an Android operating system?

e. What is the probability that 14, 15, or 16 of the 30 mobile phone users have an Android operating system?

a. Calculate the mean and standard deviation for this distribution.

b. What is the probability that 13 or more of the 30 mobile phone users have an Android operating system?

c. What is the probability that exactly 14 of the 30 mobile phone users have an Android operating system?

d. What is the probability that 7, 8, or 9 of the 30 mobile phone users have an Android operating system?

e. What is the probability that 14, 15, or 16 of the 30 mobile phone users have an Android operating system?

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

An exponential probability distribution has a mean equal to 10 minutes per customer. Calculate the following probabilities for the distribution: a. P(x < 12) b. P(x < 2) c. P(x < 10) d. P(x < 5) Assume the average time between students walking up to my desk during a statistics exam to ask a question in a desperate attempt to gain some insight into how to solve a problem is 8 minutes and follows the exponential ...A random variable follows the continuous uniform distribution between 130 and 300. a. Calculate the following probabilities for the distribution: 1. P (180 < x < 260) 2. P (130 < x < 200) 3. P (x 7 150) b. What are the ...A random variable follows the normal probability distribution with a mean of 124 and a standard deviation of 27. What is the probability that a randomly selected value from this population a. Is between 100 and 140? b. Is ...Pew Research Center surveyed adults who were 18– 64 years old and had their own children under age 18 living in their household in 2011 on the amount of time spent on various activities. The results indicated that dads ...Post your question