Answer:
Step-by-step explanation:
We're going to have to work backwards.
The sum of 4 and k is .
Half is simply that divided by 2.
Now, we'll subtract 8 from it.
Bam!
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Answer:
The minimum sample size needed for use of the normal approximation is 50.
Step-by-step explanation:
Suitability of the normal distribution:
In a binomial distribution with parameters n and p, the normal approximation is suitable is:
np >= 5
n(1-p) >= 5
In this question, we have that:
p = 0.9
Since p > 0.5, it means that np > n(1-p). So we have that:
The minimum sample size needed for use of the normal approximation is 50.