The bag of marbles has 4 green, 2 red, 5 yellow, 1 brown, and 7 blue marbles.
Total number of marble=4+2+5+1+7=19
The probability P(E) is defined as [tex] P(E)=\frac{n(E)}{n(s)} [/tex]
where n(E) is the total number of favourable events.
and n(s) is the total number of events
Hence for the given data we can write
[tex] P(E)=\frac{4}{19} [/tex]
Because total number of green marbles = n(E)=4
Total number of Marbles =n(S)=19
Hence P(E)=4/19