TIN 1 tos
der the arithmetic series 3 + 7 + 11 + 15 + 19 + 23 + 2
ons which follow.
a) (i) Ty=
3
Si= 3.
(ii)
Express Tjin terms of Si
7
b) (i) T2 =
S2 = 1.Q..
(ii)
Express T2 in terms of S2 and Si.
c) (i) T3 =
T3 = ; S3 =
; S3 = 2
.
(
ii)
Express T3 in terms of Szand S2.
1) (i)
T4= ; S4=​

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?