3 people wearing both are also counted in the 6 with socks and 4 with shoes so you can't count them twice. What you do in stead is list :
<span>3 wearing both </span>
<span>4 - 3 = 1 wearing just shoes </span>
<span>6 - 3 = 3 wearing just socks </span>
<span>total 7 so far so that leaves 5 others that must be barefoot.</span>
Step-by-step explanation:
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Answer:
answer is {-4.42, 12.54}
Step-by-step explanation:
v^2 - 8v - 59 = -2
v^2 - 8v = 57
(v - 4)^2 - 16 = 57
(v - 4)^2 = 73
Taking square roots:-
v - 4 = +/- √73
v = √73 + 4 or - √73 + 4
v = -4.54 , 12.54
I would say it's the one you have checked off on the paper.
Answer:
a) 0.1108
(b) 0.0173
Step-by-step explanation:
We are given that 20% of all stock investors are retired people. A random sample of 25 stock investors is taken.
Firstly, the binomial probability is given by;
where, n = number of trails(samples) taken = 25
r = number of successes
p = probability of success and success in our question is % of
retired people i.e. 20%.
Let X = Number of people retired
(a) Probability that exactly seven are retired people = P(X = 7)
P(X = 7) =
= = 0.1108
(b) Probability that 10 or more are retired people = P(X >= 10)
P(X >= 10) = 1 - P(X <= 9)
Now, using binomial probability table, we find that P(X <= 9) is 0.98266 at n = 25, p = 0.2 and x= 9
So, P(X >= 10) = 1 - 0.98266 = 0.0173.
