Answer:
x = 50 degrees
y = 70 degrees
z = 60 degrees
w = 70 degrees
Step-by-step explanation:
Assuming the n data values are independent draws from a Poisson distributed population with parameter λ , the MLE of λ from the sample is the sample mean, i.e.

Numerous proves are available online.
Answer:
step 2
Step-by-step explanation:
instead of subtracting 7 to the oposite side they set it aside to then later on add it towards the end.
There are 4 choose 3 ways to hold 3 kings and 4 possible queens to make up the fourth card of the hand out of a total of 54 choose 4 possible four-card hands, which gives us the following expression for the probability of being dealt 3 kings and a queen out of 4 cards: Or roughly 1 in every 16920 four card hands.