20. Each year a school organises a concert. (a) i) In 2004 the cost of organising the concert was $385.
In 2005 the cost was 10% less than in 2004.
Calculate the cost in 2005.
ü) The cost of $385 in 2004 was 10% more than the cost in 2003
Calculate the cost in 2003.
(b) i) In 2006 the number of tickets sold was 210.
The ratio Number of adult tickets: Number of student tickets was 23:19
How many adult tickets were sold?
ü) Adult tickets were $2.50 each and student tickets were $1.50 each.
Calculate the total amount received from selling the tickets
iii) In 2006 the cost of organising the concert was $410
Calculate the percentage profit in 2006.
(c) In 2007, the number of tickets sold was again 210.
Adult tickets were $2.60 each and student tickets were $1.40 each.
The total amount received from selling the 210 tickets was $480
How many student tickets were sold?

16 more than the product of 5 and p

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In a test for esp (extrasensory perception), the experimenter looks at cards that are hidden from the subject. each card contains either a star, a circle, a wave, a cross or a square.(five shapes) as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. when the esp study described above discovers a subject whose performance appears to be better than guessing, the study continues at greater length. the experimenter looks at many cards bearing one of five shapes (star, square, circle, wave, and cross) in an order determined by random numbers. the subject cannot see the experimenter as he looks at each card in turn, in order to avoid any possible nonverbal clues. the answers of a subject who does not have esp should be independent observations, each with probability 1/5 of success. we record 1000 attempts. which of the following assumptions must be met in order to solve this problem? it's reasonable to assume normality 0.8(1000), 0.2(1000)%30 approximately normal 0.8(1000), 0.2(1000)% 10 approximately normal srs it is reasonable to assume the total number of cards is over 10,000 it is reasonable to assume the total number of cards is over 1000