If a method produces a random error for each measurement of 4%, but a percent error of equal to or less than 1% is required for this value for later analysis, what is the minimum number of measurements that must be collected and averaged

7.05

Explanation:

Random error is = 0.282

Remember ( random error / total sum of errors ) x 100 = 4%

Which is 0.282/ total sum of errors = 428.2

Total sum of errors = 7.05

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current