Multiple choice: State any restrictions on the variables.
2 answers:
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Answer:
E(X₁)= 1.76
E(X₂)= 4.18
E(X₃)= 9.24
E(X₄)= 6.82
a. P(X₁=3, X₂=4, X₃=6;0.08,0.19,0.42)= 0.00022
b. P(X₁=5, X₂=5, X₄=7;0.08,0.19,0.31)= 0.000001
c. P(X₁≤2) = 0.7442
Step-by-step explanation:
Hello!
So that you can easily resolve this problem first determine your experiment and it's variables. In this case, you have 22 seedlings (n) planted and observe what happens with the after one month, each seedling independent of the others and has each leads to success for exactly one of four categories with a fixed success probability per category. This is a multinomial experiment so I'll separate them in 4 different variables with the corresponding probability of success for each one of them:
X₁: "The seedling is dead" p₁: 0.08
X₂: "The seedling exhibits slow growth" p₂: 0.19
X₃: "The seedling exhibits medium growth" p₃: 0.42
X₄: "The seedling exhibits strong growth" p₄:0.31
To calculate the expected number for each category (k) you need to use the formula:
E(X
So
E(X₁)= n*p₁ = 22*0.08 = 1.76
E(X₂)= n*p₂ = 22*0.19 = 4.18
E(X₃)= n*p₃ = 22*0.42 = 9.24
E(X₄)= n*p₄ = 22*0.31 = 6.82
Next, to calculate each probability you just use the corresponding probability of success of each category:
Formula: P(X₁, X₂,..., Xk) =
a.
P(X₁=3, X₂=4, X₃=6;0.08,0.19,0.42)= = 0.00022
b.
P(X₁=5, X₂=5, X₄=7;0.08,0.19,0.31)= = 0.000001
c.
P(X₁≤2) = +
+
= 0.7442
I hope you have a SUPER day!
The number of throws that the player make X follows binomial distribution.
The probability that the player makes x throws out of eleven throws is
The probability that the player makes at most nine out of eleven free throws
is
Correct choice is (B).