Z Tables
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Converting Z values to Percentage Values and Corresponding Number of Days
Use the two tables below to convert the value of z to the probability (%) value and to the corresponding number of days.
If you are using these tables...
- for converting a percentage value to days, just find the value. The corresponding number of days is in the right column.
- for calculating the REL, use Table 1 if the REQ.SNR is lower or equals to the predicted SNR. Use Table 2, if the REQ.SNR is greater than the predicted SNR.
- for calculating the MUFday, use Table 1 if the FREQ is equal to or below the predicted MUF. Use table 2 if the FREQ is above the predicted MUF.
Table 1. Table 2. z % Days/month z % Days/month 0.00 50.00 15.00 0.05 51.99 15.60 0.05 48.01 14.40 0.10 53.98 16.19 0.10 46.02 13.81 0.15 55.96 16.79 0.15 44.04 13.21 0.20 57.93 17.38 0.20 42.07 12.62 0.25 59.87 17.96 0.25 40.13 12.04 0.30 61.79 18.54 0.30 38.21 11.46 0.35 63.68 19.10 0.35 36.32 10.90 0.40 65.54 19.66 0.40 34.46 10.34 0.45 67.36 20.21 0.45 32.64 9.79 0.50 69.15 20.74 0.50 30.85 9.26 0.55 70.88 21.27 0.55 29.12 8.73 0.60 72.57 21.77 0.60 27.43 8.23 0.65 74.22 22.26 0.65 25.78 7.74 0.70 75.80 22.74 0.70 24.20 7.26 0.75 77.34 23.20 0.75 22.66 6.80 0.80 78.81 23.64 0.80 21.19 6.36 0.85 80.23 24.07 0.85 19.77 5.93 0.90 81.59 24.48 0.90 18.41 5.52 0.95 82.89 24.87 0.95 17.11 5.13 1.00 84.13 25.24 1.00 15.87 4.76 1.05 85.31 25.59 1.05 14.69 4.41 1.10 86.43 25.93 1.10 13.57 4.07 1.15 87.49 26.25 1.15 12.51 3.75 1.20 88.49 26.55 1.20 11.51 3.45 1.25 89.44 26.83 1.25 10.56 3.17 1.30 90.32 27.10 1.30 9.68 2.90 1.35 91.15 27.34 1.35 8.85 2.66 1.40 91.92 27.58 1.40 8.08 2.42 1.45 92.65 27.79 1.45 7.35 2.21 1.50 93.32 28.00 1.50 6.68 2.00 1.55 93.94 28.18 1.55 6.06 1.82 1.60 94.52 28.36 1.60 5.48 1.64 1.65 95.05 28.52 1.65 4.95 1.48 1.70 95.54 28.66 1.70 4.46 1.34 1.75 95.99 28.80 1.75 4.01 1.20 1.80 96.41 28.92 1.80 3.59 1.08 1.85 96.78 29.04 1.85 3.22 0.96 1.90 97.13 29.14 1.90 2.87 0.86 1.95 97.44 29.23 1.95 2.56 0.77 2.00 97.72 29.32 2.00 2.28 0.68 2.05 97.98 29.39 2.05 2.02 0.61 2.10 98.21 29.46 2.10 1.79 0.54 2.15 98.42 29.53 2.15 1.58 0.47 2.20 98.61 29.58 2.20 1.39 0.42 2.25 98.78 29.63 2.25 1.22 0.37 2.30 98.93 29.68 2.30 1.07 0.32 2.35 99.06 29.72 2.35 0.94 0.28 2.40 99.18 29.75 2.40 0.82 0.25 2.45 99.29 29.79 2.45 0.71 0.21 2.50 99.38 29.81 2.50 0.62 0.19 2.55 99.46 29.84 2.55 0.54 0.16 2.60 99.53 29.86 2.60 0.47 0.14 2.65 99.60 29.88 2.65 0.40 0.12 2.70 99.65 29.90 2.70 0.35 0.10 2.75 99.70 29.91 2.75 0.30 0.09 2.80 99.74 29.92 2.80 0.26 0.08 2.85 99.78 29.93 2.85 0.22 0.07 2.90 99.81 29.94 2.90 0.19 0.06 2.95 99.84 29.95 2.95 0.16 0.05 3.00 99.87 29.96 3.00 0.13 0.04 3.05 99.89 29.97 3.05 0.11 0.03 3.10 99.90 29.97 3.10 0.10 0.03 3.15 99.92 29.98 3.15 0.08 0.02 3.20 99.93 29.98 3.20 0.07 0.02 3.25 99.94 29.98 3.25 0.06 0.02 3.30 99.95 29.99 3.30 0.05 0.01 3.35 99.96 29.99 3.35 0.04 0.01 3.40 99.97 29.99 3.40 0.03 0.01