Let Y be the random variable sales in 1 year.
You should realise that Y ~ Normal (read this: Sum of normally distributed random variables - Wikipedia, the free encyclopedia).
Find Pr(Y > 12,600).
The monthly sales of a chocolate company is believed to be normally distributed with a mean of 1,000 bars and a standard deviation of 150 bars.Find the probability that the total sales in the next year is over 12,600 bars with assuming that the sales of the 12 months are independent.
Let Y be the random variable sales in 1 year.
You should realise that Y ~ Normal (read this: Sum of normally distributed random variables - Wikipedia, the free encyclopedia).
Find Pr(Y > 12,600).