The number of boys in the tennis club is 10mire than half the number of girls. there are 30 boys in the tennis club. all together, how many boys and girls are in the club.

36

Step-by-step explanation:

Let the number of girls in club be

Number of boys = 30

Number of boys is 10 times half the number of girls

i.e.

Total number of boys and girls in club = 30 + 6 = 36

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560

it is 10.6 according to my calculations