Ahmad does a part-time job as a cashier at JayaGrocery since last year. He obtained an average wage of RM10.50 an hour with a standard deviation of RM1.50. If the wages are approximately normally distributed and paid to the nearest cent. (Note: 2 dp = 2 decimal places) (a) What percentage of Ahmad receive wages between RM9.50 and RM12.0 an hour inclusive? The z values corresponding to X = 9.50 is Answer (2 dp) The z values corresponding to X = 12.0 is Answer (1 dp) Percentage = Answer% (1 dp)   (b) The highest 5% of the hourly wages are greater than what amount? P(Z = ?) = 1 - Answer = Answer (2 dp) a = Answer    (2 dp) X = Answer (1 dp)

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.