Question

the probability of getting a bad pen in a lot of 400 pens is 0.25 the number of good pens in the lot is​

Answer 1

therefore 300 good pens in lot

Answer 2

Step-by-step explanation:

$\sf {\bold {\huge {\underline {\underline {ANSWER}}}}}$

$\sf n( S ) = 400$

$\sf Let\:A\:be\:set\:of\:bad\:pen$

$\sf P (A) = 0.25$

$\frac {n ( A ) }{n ( S ) }$ = 0.25

$\sf n ( A ) = 0.25 × 400$

$\sf n ( A ) = 100$

$\sf so\:there\:are\:100\:bad\:pens$

$\therefore$$\sf {\bold {\underline {\boxed {There\:are\:300\:good\:pens }}}}$

$\marque\bold {\large {THANKS!!!}}}$