How many minutes did it take him to cover 1 mile? 5 minutes.
A)
Let c be the number of right guesses.
the probability of c answers =.25 and probability of the wrong answer is 1-.25=.75
c distribution is in the parameter of (20, .25).
b) mean = 20 * .25== 5
c) p of c guess =.25 ^20 =9.095* 10 ^-13
d) p of 10 c guess =.014 or 1.4% it is not possible for him to have 10 right guess.
For this case we have the following equation:

From here, we must clear the value of y.
For this, we follow the following steps:
1) Distributive property:

2) Variable terms on one side of the equation and constant terms on the other side of the equation:

3) Algebraically add the constant terms:

4) Pass the number 20 to divide:

Answer:
The value of y is given by:
