An adult blinks about 450 times in 30 minutes and a 12 year old blinks about 150 times in 15 minutes. how many more times does an adult blink in 60 minutes than a 12 year old?

300

Step-by-step explanation: 450 x 2= 900

Adult blinks 900 times an hour

15 x 4 = 60

150 x 4 = 600

900 - 600 = 300

step-by-step explanation:

1

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