Okay my calculator now says it's 68.
70 minutes of you are putting them all on a once or 420 minutes = 7 hours
Answer:
Step-by-step explanation:
Given that:
P(Y) = ky
where;
y =1,2,...7
To find the value of c or k (constant)
= k(1+2+3+4+5+6+7) = 1
28k = 1
b) The required probability is P ( X ≤ 3)
P ( X ≤ 3) = 0.2143
c) The required probability P(2 ≤ Y ≤ 4)
d) The required probability: