A study indicates that 18- to 24-year olds spend a mean of 140 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 20 minutes. Complete parts (e) through (d) below. a What is the probably that on 18 to 24-year old spends less than 105 minutes watching video on his or her smartphone per month? The probably that an 18 to 24-year-old spends Mess than 105 minutes watching video on his or her smartphone per month is 0401 (Round to four decimal places as needed.) b. What is the probability that on 18 to 24 year old spendo between 105 arid 160 minutes watching video on his or her smartphone per month The probability that an 18 to 24 year old spends between 105 and 160 minutes watching video on his or her umartphone per month (Round to four decimal places as needed)