The binomial probability formula can be used to find the probability of a binomial experiment for a specific number of successes. It does not find the probability for a range of successes, as in this case.

The range "x≤4" means x = 0 or x = 1 or x = 2 or x = 3 or x = 4, so there are five different probability calculations to do.

To to find the total probability, we use the addition rule that states that the probabilities of different events can be added to find the probability for the entire set of events only if the events are Mutually Exclusive. The outcomes of a binomial experiment are mutually exclusive for any value of x between zero and n, as long as n and p don't change, so we're allowed to add the five calculated probabilities together to find the total probability.

The probability that x ≤ 4 can be written as P (X ≤ 4) or as P (X = 0 or X = 1 or X = 2 or X = 3 or X = 4) which means (because of the addition rule) that P(x ≤ 4) = P(x = 0) + P(x = 1) + P (x = 2) + P (x = 3) + P (x = 4)

Therefore, the probability of x<4 successes is P (X ≤ 4)

3 0

2 years ago

Becky tried to evaluate an expreisson step by step

NNADVOKAT [17]

Answer:

step 2

Step-by-step explanation:

1) so in step 2 Becky make 4/5-5/4=0

this is wrong, as we have to make common denominators first:

16/20-25/20=-9/20

so now, we got -9/20

-9/20+7=

2) make common denominators again

-9/20+140/20=131/20

this is the right answer Hope this helps!

6 0

2 years ago