The probability of getting two prime numbers when two numbers are selected at random and without replacement, from 1 to 10 is 2/15.
Chat with our AI personalities
20, 40, 50
110
About 48% or if you want to be more accurate the actual answer was 47.826%
The chance of not winning on one attempt is 1 - 0.008 = 0.992 The chance of not winning over 110 attempts is therefore 0.992110, since you must fail every time. 0.992110 = 0.413 (to three decimal places). (It follows that 0.587 is the chance of winning on at least one attempt.)
With a mean score of 110 and a standard deviation of 18, what percentage of scores would be less than 155?