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The number of hours a toddler watches cartoons a day is defined as a normal R.V. (random variable) with the mean value of 1 and standard deviation value of 1.

The number of hours a toddler spends playing on the iPad in a day is likewise a normal R.V. (random variable) that is independent of the number of hours watching cartoons. The mean value of this Normal R.V. is 1 and the standard deviation value is .

Let M be the total screen time a toddler performs every single day (Sum of cartoon time and iPad time).

Find the Probability that the toddler (spends between 1 and 4 hours of screen time).