Answer:
i dont know sorry im doing a test and i also eed the answer :/
Step-by-step explanation:
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Answer:
a) How many African-Americans would you expect to get promotions?
Since we have been asked to follow the binomial distribution, (B (40,0.2)
To calculate the mean of the BPD = n*p
where n is the number of promotions and p = probability
= 40 x 0.2 = 8
You expect 8 promotions.
b)
The probability that 5 African-Americans = P (X = 5)
P( X = 5 ) = 40 sqr root ( 5 * 0.2^5 * 0.8^35 ) = 0.0854
c) What is the probability that five or fewer African-Americans receive promotions?
P( X <= 5) = P(X=5) + P(X=4) + ... + P(X=1) + P(X=0)
faster way is calculator
binomcdf(40, .2, 5) = 0.1613
Step-by-step explanation:
Answer: I think 5.3
Step-by-step explanation:
I did the a method then checked over it :/
For this case we have that a quadratic equation is of the form:

The roots are given by:

We have the following equation:

We look for the roots:

We have to:

So:

We have two imaginary roots:

Answer:
