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hi sir,
i am doing a question from kaplan exam kit
the question iscaroline has recently developed a new product. the nature of carolines work is repetitive, and it is usual for there to be an 80% learning effect when a new product is developed. the time taken for the first unit was 22 minutes. an 80% learning effect applies.
what is the time to be taken for the fourth unit in minutes?
a. 17.6 minutes
b. 14.08 minutes
c 15.45 minutes
d. 9.98 minutesthe way i have done this question is:-
units cumulative average time total time
1 22 minutes 22 minutes
2 (22*0.8) 17.6 minutes 35.2 minutes
4 (17.6*0.8) 14.08 minutes 56.32 minutesso i got my answer as option b (14.08 minutes) but when i checked its wrong
please guide me..I think Sir Moffat taught it this way :
Time for 4th unit = Time for first 4units less time for first 3units
What you got is time for first 4units and not for a fourth unit.
So to get time for first 3units, your basic approach won’t apply as 3 is not a multiple of 2.
y = a times x exponent b where y= average time for first x units and b= log0.8/log2=0.3219y= 22*3 exp -0.3219=15.447
Time for first 3units
= 3*150447 =46.34For 4units you hoy 56.32
So 56.32 – 46.34 = 9.98 minutes
Is this right Sir Moffat?
Fredymalia: Please do not answer in this forum, because it is Ask the Tutor (but please do help people in the other F5 forum 🙂 )
Sattar786: You have calculate the average time per unit if they make 4 units. That is not what is asked for – the question asks for the time for the 4th unit, and what Fredymalia has written is correct.
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