Answer:
The 95 % confidence interval of the mean of the time playing video games. is

Explanation:
From the question we are told that
The sample size is

The sample mean is

The standard deviation is

The confidence level is 95% hence the level of significance is mathematically represented as

%

Now the critical value of half of this level of significance obtained from the normal distribution table is

The reason for the half is that we are considering the two tails of the normal distribution curve which we use to obtain the interval
Now the standard error of the mean is mathematically evaluated as

substituting values


the 95 % confidence interval of the mean of the time playing video games.
is mathematically evaluated as

substituting values

