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401666
20.09.2020 •
Mathematics
. What is the total number of digits
printed, if a book containing 150
pages is to be numbered from 1 to
150?
Solved
Show answers
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Ответ:
Solution :-
Total number of pages in the book = 150
Total number of one digit numbers = From 1 to 9
= 1*9
9 digits
Total number of two digit numbers = From 10 to 99
= 2*90
= 180 digits
Total number of three digit numbers = From 100 to 150
= 3*51
= 153 digits
Total number of digits printed in the book containing 150 pages
= Total number of one digit numbers + Total number of two digit numbers +
Total number of two digit numbers
= 9 + 180 + 153
= 342 Digits
Hence, total 342 digits are printed in the book which has 150 pages.
Ответ:
Step-by-step explanation:
given that after scoring a touchdown, a football team may elect to attempt a two-point conversion, by running or passing the ball into the end zone. If successful, the team scores two points.
X=1 if successful and
X=0 if not
pdf of X is
X 1 0
p 0.8 0.2
E(x) =![1(0.8)+0(0.2)\\=0.8](/tpl/images/0531/8109/af7fc.png)
Var(x) = 0.8-0.8*0.8
= 0.16
Now let us consider Y.
Y is the no of points scored.
Y 2 0
p 0.8 0.2
E(Y) =![2(0.8)+0(0.2)\\=1,.6](/tpl/images/0531/8109/9e430.png)