Agroup of college djs surveyed students to find out what music to plan for their upcoming parties. thirty percent of the students preferred dubstep, 25% of the students liked trance music, and 20% wanted to hear only house music. fifteen percent of the respondents selected both dubstep and trance.

a - the proportion of students that like trance music but not dubstep is:

a) 20% .

b) 5% .

c) 10% .

d) 15%

b - the proportion of students that like either dubstep or trance is:

a) 40% .

b) 100% .

c) 55% .

d) 70% .

c - the proportion of students that like neither trance music nor dubstep is:

a)60% .

b) 20% .

c) 0% .

d) 40% .

d - the proportion of students that didn’t select any of the music options available on the survey was:

a) 0% .

b) 40% .

c) 20% .

d) 60% .

e - the proportion of students that preferred either dubstep or trance is calculated by:

a) p(a)+p(b)+p(a and b) .

b) none of the answer options are correct.

c) p(a)+p(b) .

d) p(a)+p(b)? p(a and b) .

f - the conditional probability that a student likes dubstep, given that he or she likes trance music, is:

a) 70% .

b) 65% .

c) 60% .

d) 55% .

A - The proportion of students that like trance music but not dubstep is 10%

B - The proportion of students that like either dubstep or trance is 40%

C - The proportion of students that like neither trance music nor dubstep is 60%

D - The proportion of students that didn’t select any of the music options available on the survey was 40%

E - The proportion of students that preferred either dubstep or trance is calculated by: P(D) + P(T) - P(D and T)

F - The conditional probability that a student likes dubstep, given that he or she likes trance music, is 60%

Step-by-step explanation:

P(D)=the students preferred dubstep=30%

P(T)=the students selected trance music=25%

P(H)=the students selected house music=20%

P(D and T)=the students liked both dubstep and trance=15%

A - The proportion of students that like trance music but not dubstep is:

P(T) - P(D and T)=25%-15%=10%

B - The proportion of students that like either dubstep or trance is:

P(D) + P(T) - P(D and T) =30%+25%-15% = 40%

C - The proportion of students that like neither trance music nor dubstep is

100% - (P(D) + P(T) - P(D and T) ) =60%

D - The proportion of students that didn’t select any of the music options available on the survey was:

100% - (P(H)+P(D) + P(T) - P(D and T) ) =40%

F - The conditional probability that a student likes dubstep, given that he or she likes trance music, is:

=

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step-by-step explanation:

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.