![]() ![]() Step 3: Finally, the normal distribution of the given data set will be displayed in the new window. Step 2: Now click the button Calculate to get the probability value. The proportion (%) of the SND to the left of the z-score. The procedure to use the normal distribution calculator is as follows: Step 1: Enter the mean, standard deviation, maximum and minimum value in the respective input field. The corresponding area is 0.8621, which translates into 86.21% of the standard normal distribution being below (or to the left) of the z-score.įigure 3. If a distribution is normal but not standard, we can convert a value to the Standard normal distribution table by first by finding how many standard. Using a z-score table to calculate the proportion (%) of the SND to the left of the z-score. List of formulae and statistical tables Cambridge International AS & A Level Mathematics (9709) and Further Mathematics (9231). ![]() ![]() Then, we look up the remaining number across the table (on the top) which is 0.09 in our example.įigure 2. First, look at the left side column of the z-table to find the value corresponding to one decimal place of the z-score (e.g., whole number and the first digit after the decimal point). This is the equivalent of referencing a z-table. A z-score table shows the percentage of values (usually a decimal figure) to the left of a given z-score on a standard normal distribution.įor example, imagine our Z-score value is 1.09. Calculator to find out the z-score of a normal distribution, convert between z-score and probability. ![]()
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