Z-scores 3

The topic of  is under the Probability and statistics Math Mission. This exercise calculates probabilities from a standard normal table.

Types of Problems
There is one type of problem in this exercise:


 * 1) Find the probability using the table: This problem describes a normal distribution with a mean and a standard deviation. It asks the student to calculate the probability that a score would fall between the two given values.Zscore3-1.png

Strategies
This exercise is medium to get accuracy badges because you first need to learn how to use the standard normal table. Once this is done, the speed badges are medium because you need to look at the table twice and do some strategic complementation on many problems.
 * 1) You will have to calculate the z-score to look it up in the table. The formula to find the z-score is to take the value, and calculate $$ (x-\mu)/ \sigma $$.
 * 2) You will find the probability of the higher score happening and subtract from that the probability of the lower score happening.
 * 3) If you have a positive z-score the probability is the number in the table.
 * 4) If you have a negative z-score the probability is the number in the table subtracted from one.