CHAPTER 18. STATISTICS 18.6
(a) What is the mean income and the standard deviation?
(b) How many of the salaries are within one standard deviation of the mean?
(c) If each teacher getsa bonus of R 500 added to their pay what is the new mean
and standard deviation?
(d) If each teacher getsa bonus of 10% on their salary what isthe new mean and
standard deviation?
(e) Determine for bothof the above, how many salaries are within one standard
deviation of the mean.
(f) Using the above information work out which bonus is more beneficial financially
for the teachers.
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(1.) 0161 (2.) 0162 (3.) 0163
