A population is known to have a right-skewed distribution with mean 10, median 6.931 and standard deviation 10. A sample size n=100 is drawn from this population. The sampling distribution of the sample mean, x bar, approximately follows a normal distribution with mean _______ and standard deviation ______. Based on this normal approximation, what is the probability that the sample mean is less than 0.8?________

answers: 10, 1, 0.421

I just want to know how the working was done. Use of excel is allowed for this statistic problem.