Answer the given problem below related to work study and measurement. (Show required solutions.)

5. Supervisor Philip Musa wants to determine the percentage of time his secretary devotes on her various activities for a given day. He decides to use work sampling and the results are shown below: (5a) How many observations should Musa take in order to be 98% confident that his estimate of percent time spent typing will be no more than 5% away from the true value? (5b) If he is interested on the percentage idle time, how many samples are needed for him to be 95.45% confident that it will be within 3% of the true value? 6. A work element in a manual assembly task consists of the following MTM-1 elements: (1) R16C, (2) G4A, (3) M10B5, (4) RL1, (5) R14B, (6) G1B, (7) M8C3, (8) P1NSE, and (9) RL1. (6a) Determine the normal times in TMUs for these motion elements. (6b) What is the total time for this work element? Express answer in minutes per 1000 units. 7. The analyst in the Dorben Company made 10 independent time studies in the hand paintspraying section of the finishing department. The product line under study revealed a direct relation between spraying time and product surface area. The following data were collected. (7a) Compute the slope and intercept constant using regression line equations. (7b) What is the correlation coefficient? (7c) How much spray time would you allow for a new part with a surface area of 250 sq. inches