20LindleyN
15.10.2020 •
Mathematics
Exercise 2.23. The probability that there is no accident at a certain busy
intersection is 95% on any given day, independently of the other days.
(a) Find the probability that there will be no accidents at this intersection
during the next 7 days.
(b) Find the probability that next September there will be exactly 2 days with
accidents.
(c) Today was accident free. Find the probability that there is no accident
during the next 4 days, but there is at least one by the end of the 10th day.
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Ответ:
It says Sandeep has twice as much as Sonia. Thus, let Sandeep's amount be 2x and Sonia's amount be x.
Now, together they have 150.
Thus, the equation;
x+2x=150
Now let's solve the equation;
3x=150
x=150/3
x=50
Thus, Sonia has 50