![]() ![]() It always has a mean of zero and a standard deviation of one. Therefore, the 10th percentile of the standard normal distribution is -1.28. The standard normal distribution is a normal distribution represented in z scores. We look to the leftmost of the row and up to the top of the column to find the corresponding z-value. For example, the value for 1.96 is P (Z>1.96). The table value for Z is 1 minus the value of the cumulative normal distribution. The general form of its probability density function is The parameter is the mean or expectation of the distribution (and also its median and mode ), while the parameter is its standard deviation. Standard Normal Table (right tailed) Z is the standard normal random variable. We search the body of the tables and find that the closest value to 0.1000 is 0.1003. In statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. Since the entries in the Standard Normal Cumulative Probability Table represent the probabilities and they are four-decimal-place numbers, we shall write 0.1 as 0.1000 to remind ourselves that it corresponds to the inside entry of the table. The question is asking for a value to the left of which has an area of 0.1 under the standard normal curve. To find the probability between these two values, subtract the probability of less than 2 from the probability of less than 3.
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