Exponent of $4$ in $80!$ is

Q. The exponent of $4$ in $4\times 4\times 4$ is
.

Q. A random sample of $1,000$ men was selected and each individual was asked to indicate his age and his favorite sport. The results were as follows.

Age/ Sports	Volleyball	Basket ball	Hockey	Football
Below $20$	$26$	$47$	$41$	$36$
$20-29$	$38$	$84$	$80$	$48$
$30-39$	$72$	$68$	$38$	$22$
$40-49$	$96$	$48$	$30$	$26$
$50$ and above	$134$	$44$	$18$	$4$

If a respondent is selected at random, what is the probability that he prefers Volleyball

Q. A random sample of $1,000$ men was selected and each individual was asked to indicate his age and his favorite sport. The results were as follows.

Age/ Sports	Volleyball	Basket ball	Hockey	Football
Below $20$	$26$	$47$	$41$	$36$
$20-29$	$38$	$84$	$80$	$48$
$30-39$	$72$	$68$	$38$	$22$
$40-49$	$96$	$48$	$30$	$26$
$50$ and above	$134$	$44$	$18$	$4$

If a respondent is selected at random, what is the probability that he is between $20-29$ years old

Q. If $\int (e^{7x+4}+(5x-3{)}^8)=\frac{e^{7x}+4}{7}+\frac{(5x-3{)}^9}{b}$.Find $b$