Question 1 Background : Battery Life Suppose the battery life for a fully charged iPhone 12 is normally distributed with a mean of 424 minutes and a standard deviation of 60 minutes. Question 1 Subquestions 1.a TBD What proportion of fully charged iPhone 12s will have a battery life less than 520 minutes? As part of your work include a sketch (this could be a hand sketch or the image saved from technology using R Shiny App (you can find a link to this points applet on the Student Resources page of our Stats 250 Canvas site)). No answer entered. Click above to enter an answer. 1.b TBD Find the value that completes the following statement: points 20% of fully charged iPhone 12s will have a battery life longer than minutes. Be sure that your work includes a z-score and that we can follow your logic of how you obtained this missing value. No answer entered. Click above to enter an answer. 1.C TBD Suppose the battery life for a fully charged iPhone 13 is normally distributed with a mean of 633 minutes. points Adeola recently upgraded their phone to an iphone 13 but has noticed a decrease in battery life compared to their old device. They decide to seek technical help. According to an Apple technician, about 10% of iPhone 13s have a faulty battery and have a battery life of at most 581 minutes, when fully charged. In other words, 10% of iPhone 13s have a battery life of 581 minutes or less. Based on the information provided, what is the standard deviation for the battery life for fully changed iPhone 13s? 60 minutes 52 minutes 40.625 minutes 43.333 minutes