When marla round and 19.95 to the nearest tenth she found the number change to 20. explain how this is right plz

It is right because whenever we have 5, we have to round the digit to the left up by one. So 19.95 would become 20 

The correct answer is 70.54%.

The first thing to do is find the z-score for precipitation over 18 inches. You have to subtract the value from the mean and divide by the standard deviation.

18 - 19.32 = -1.32 / 2.44 = -0.54

Now, just look up the z-score of -0.54 on a standard normal distribution table and you will see that 29.46% of the scores are below 18 inches. Therefore, there are 70.54% scores above 18 inches.