At southside middle school, 30% of the students play an instrument. there are 310 students. how many students play an instrument

93 students play an instrument.

Step-by-step explanation:

At Southside Middle School percentage of students who play an instrument = 30%

Let total number of students in the school are = x

Then students who play an instrument = 30% of x

                                                                = 0.30x

If x = 310, then the number of students who play an instrument will be

= 0.30×310

= 93 students

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

the answer is mp

step-by-step explanation: