Question

How many apps? According to a website, the mean number of apps on a smartphone in the United States is 86 . Assume the number of apps is normally distributed with mean 86 and standard deviation 25.

Answer 1

To find the probability that a smartphone in the United States has a certain number of apps, we can use the concept of the normal distribution. The mean number of apps on a smartphone is 86, and the standard deviation is 25. We can calculate the probability of a smartphone having a certain number of apps by using the z-score formula.

Step-by-step explanation:

To find the probability that a smartphone in the United States has a certain number of apps, we can use the concept of the normal distribution. The mean number of apps on a smartphone is 86, and the standard deviation is 25. We can calculate the probability of a smartphone having a certain number of apps by using the z-score formula:

z = (x - mean) / standard deviation

Where x is the number of apps we want to find the probability for. We can then use a z-table or a calculator to find the corresponding probability.