Standard Normal Distribution (Z) = -40 / 10.Standard Normal Distribution (Z) = (55 – 95) / 10. Find the probability of a random score falling between 55 and 85. The average marks scored by candidates in the English test for a particular class is 95, and the standard deviation is 10. Standard Normal Distribution Formula – Example #3 The probability that a motorbike would travel at a speed of more than 95 Km/Hr is 2.5.
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