Time in minutes | Number of people | Rel. Freq. P ( x ) | x * P ( x ) |
---|---|---|---|
15 | 63 | ||
30 | 28 | ||
45 | 35 | ||
60 | 30 | ||
75 | 37 | ||
Sums: |
Statistic or Parameter | Symbol | Equations | Excel |
---|---|---|---|
Calculate a z value from an x | z | = | =STANDARDIZE(x, µ, s) |
Calculate an x value from a z | x | = s z + µ | = s*z+µ |
Find a probability p from a z value | =NORMSDIST(z) | ||
Find a z value from a probability p | =NORMSINV(p) |