Add 7 and 7 which is 14 and then take it apart because it is an even number
<span>
Based on the rules of statistics</span>
68% of the data falls within 1 standard deviation of the mean
95% of the data falls within 2 standard deviation of the mean
99% of the data falls within 3 standard deviation of the mean
20 falls between the range of -56 to 56 (from the given 95%)
Hence we accept the null hypothesis; else, if the mean falls outside the
range, we reject the null hypothesis.
<span> </span>
Subtract 6.7 from 20. This is 13.3. Divide 13.3/5 is 2.66. That is the answer
