Help please?

1 answer:

6 0

13)4n-40=-14n+14
=4n+14n=14+40
=18n=54
n=54/18
n=3

14)35a-28-1=14-8a
35a+8a=14+29
43a=43
a=43/43
a=1

15)-31-4x=-5-5-25x
-4x+25x=-10+31
21x=21
x=21/21
x=1

16)38+7k=8k+32
7k-8k=32-38
-k=-8
k=-8/-1
k=8

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b) $P(4\leq X\leq 8)=0.1954+0.1563+0.1042+0.0595+0.0298=0.5452$

c) $P(X \geq 8) = 1-P(X$

d) $P(4\leq X \leq 6)=0.1954+0.1563+0.1042=0.4559$

Step-by-step explanation:

Let X the random variable that represent the number of material anomalies occurring in a particular region of an aircraft gas-turbine disk. We know that $X \sim Poisson(\lambda=4)$