b. 0.7 c. 0.9 XX<3.4)= 7. If the random variable X has a chi-square distribution with degrees of freedom r, and if E(5X+3)=33. find var (X) a. 3.46 b.12 c. 36 d. e-l d. 6 = 0.5 +0.2e*+0.2e³ +0.1e St 8. Let X have a negative binomial distribution with rand P=0.6. If the mean of X is 5 then r equal a. 1.8 b. 0.83 c. 3 d.9 e. None e that X has an exponential distribution. If Var (4-4) 20 b.0 0.5 -20 e. None e. None
b. 0.7 c. 0.9 XX<3.4)= 7. If the random variable X has a chi-square distribution with degrees of freedom r, and if E(5X+3)=33. find var (X) a. 3.46 b.12 c. 36 d. e-l d. 6 = 0.5 +0.2e*+0.2e³ +0.1e St 8. Let X have a negative binomial distribution with rand P=0.6. If the mean of X is 5 then r equal a. 1.8 b. 0.83 c. 3 d.9 e. None e that X has an exponential distribution. If Var (4-4) 20 b.0 0.5 -20 e. None e. None
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Question
pleaseeeee solve question 7, quickly please
Transcribed Image Text:2. How many different four-digit numbers can be formed from the digits 1,2,3,4,5,6,7 such that
the first digit 3 or 6 also you cannot repeat the digit
a. 240
b.48
c. 120
P(A)
3. If A, B and C are mutually independent events and that P(A) = 0.3, P(B) = 0.2, P(C) = 0.4.
The probability that at least one of the events occur is
a. 0.336
b.0.664
c. 0.024
a. 0.4
4. A box contains 3 red balls and 5 black balls. Balls are drawn randomly one at a time with
replacement from the box. The probability that the third red ball is the seventh ball drawn is.
a. 0.169
b.0.282
c. 0.179
d. 0.121
e. None
5. A box contains 20 balls, 13 of them are red and the rest are blue. Three balls are drawn randomly
without replacement. The probability of getting at least 1 blue ball is.
a) 0.749
b) 0.251
c) 0.479
d) 0521
b. 0.7
c. 0.9
6. The moment generating function of a random variable X M(t) = 0.5 +0.2e+0.2e³ +0.1e³t
Then P(-1.5<X<3.4)=
d. e-1
7. If the random variable X has a chi-square distribution with degrees of freedom r, and
if E(SX+3)=33. find var (X)
a. 3.46
b.12
d. 24
c. 36
d. 0.976
d. 6
ve that X has an exponential distribution. If Var (4-4-
20
b.0
0.5
e. None
e. None
8. Let X have a negative binomial distribution with rand P=0.6. If the mean of X is 5 then requal
b. 0.83
a. 1.8
c. 3
d.9
e. None
=20
e) none
e. None
e. None
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