Final answer:
The question seems to confuse the lifetime of a cell phone with the battery life between charges. For the NeverReady batteries exercise, a sample mean of 16.7 hours with a low probability suggests the company's claim may be unreasonable. Calculating energy content and duration involves using power and operational time for the devices mentioned.
Step-by-step explanation:
Understanding the Battery Life of Smartphones and Other Devices
Firstly, there seems to be a confusion regarding the question about a smartphone model's battery life as the lifetime mentioned in the exercises provided refers to that of the cell phone itself, not the battery life in terms of hours or days of usage before a recharge is needed. However, if we consider the information given, the average lifetime of a cell phone is three years and follows an exponential distribution, then the median lifetime in reference to exercise 93, would be option b, 1.3863 years.
Regarding the NeverReady batteries, if a company claims an average lifespan of 17 hours for their battery and a sample mean of 16.7 hours is found with a probability of 2%, this casts doubt on the claim, suggesting it may not be reasonable. Lastly, for calculating energy content and duration for a battery, in exercise 40, the energy content can be found using the power required by the clock and the time of operation (in seconds), giving the total energy in joules. The duration a battery can run a device can similarly be calculated by dividing the total energy by the power consumption rate of the device.