Marlene has noticed that she spends a lot of time in front of a screen. She spends all day working in front of a computer screen, she spends time relaxing and watching her favourite shows in front of a TV screen and before she goes to sleep she spends time looking at things on her phone screen. Marlene thinks she should probably cut down on the time she spends on her phone before going to sleep. On any given night, Marlene believes that the amount of time she spends on her phone is uniformly distributed between 30.9 and 71.8 minutes. Assume that the amount of time Marlene spends on her phone is independent from night to night. Calculate the variance of the total amount of time that Marlene spends on her phone at night this weekend (Friday night, Saturday night and Sunday night). Do not include any units in your answer.

The amount of time that Kelly uses her phone at work on any given day is uniformly distributed between 48 and 85 minutes. Ass that the amount of time that Kelly uses her phone at work is independent from day to day. Find the probability that Kelly used her phone for more than 61 minutes on Monday or between 53 and 76 minutes on Wednesda Answer:

A person works on a help line for a company.  They spend most of their time on the phone but in any hour of work there may be time spent not on the phone, eg making notes, attending to email etc.Let X = the number of phone calls that the person takes in 1 hour and assume X ~ Poi(6).  Furthermore let Y = time taken to deal with a call (in mins) and assume Y ~ N(8,2.52)Based on the above information, what is the average amount of time spent on the phone in 1 hour of work?a.6 * 8 + 1.96 * 2.5 = 52.9 minutesb.6 *8 = 48 minutesc.impossible to calculate without more informationd.6 * 8 + 2.52 = 54.25 minutes

My mobile phone told me I spent 312 minutes on the phone last week. If I spend 40 minutes less this week but 15 minutes more next week, for how many minutes will I use my phone next week?

You spend 217 minutes playing games on your phone each day. If you do this for a whole year (365 days), how many entire days of your life did you spend playing games?Hint: First multiply 217 x 365 to get the total number of minutes that you spent playing games, then convert the minutes to days.60 minutes = 1 hour24 hours = 1 dayRound your answer to the nearest tenth.

orWatch a videoFind the equation for the least squares regression line of the data described below.Judith isn't getting enough sleep and suspects it's due to playing too many video games before bed. To find out, she decided to track how much time she spends gaming.Over several days, Judith recorded how many hours of sleep she had gotten each night, x, as well as how many hours she had spent playing video games before bed, y.Hours of video games Hours of sleep0.7 100.9 101.1 52.6 53.3 4Round your answers to the nearest thousandth.