Leon packs thirty business envelopes in each of twenty-five boxes and thirty regular envelopes in each of twenty boxes. How many envelopes does he pack?

1350 envelopes

Step-by-step explanation:

From the question, Leon packs thirty business envelopes in each of twenty-five boxes. The total business envelopes here will be:

= 30 × 25

= 750

Leon picked thirty regular envelopes in each of twenty boxes. The total regular envelopes will be:

= 30 × 20

= 600

Total envelopes will now be:

= 750 + 600

= 1350 envelopes

answer is 144

step-by-step explanation:

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