The question says~Find the number that makes the ratio equivalent to 1:4....4: ?
2 answers:
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a.
Looking up 1.4 in the standard normal table,
Answer: 8.1%
b.
The standard deviation of the average is the standard deviation of an individual sample divided by the square root of n.
Answer: 76.7%
c.
We know the data is normal so so is its sum and average. The standard deviation of the individual observations is given so the standard deviation of an average of n is easily calculated. We use t tests when we're estimating the standard deviation from the data.