50 /10 = 5
5 * 9 = 45
45 is 9/10 of 50
This hard lol gn
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Answer:
a

b

c
Step-by-step explanation:
From the question we are told that
The number of success is n = 5
The time duration is N = 125 minutes
Generally the mean of the random variable is mathematically represented as

=> 
=> 
Generally the rate parameter is mathematically represented as

=> 
=> 
Generally the cumulative distribution function for exponential distribution function is
Generally the probability that the time to success will be more than 63 minutes is mathematically represented as

Here
=>
=>
So
You have to divide 4 and 1 and add 3 which equals 7