Mathematics, 10.05.2020 16:57 daniecott
The manager of a computer retails store is concerned that his suppliers have been giving him laptop computers with lower than average quality. His research shows that replacement times for the model laptop of concern are normally distributed with a mean of 4.3 years and a standard deviation of 0.4 years. He then randomly selects records on 27 laptops sold in the past and finds that the mean replacement time is 4.1 years.
Assuming that the laptop replacment times have a mean of 4.5 years and a standard deviation of 0.5 years, find the probability that 32 randomly selected laptops will have a mean replacment time of 4.3 years or less.
P(M < 4.3 years) =
Enter your answer as a number accurate to 4 decimal places. NOTE: Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
Based on the result above, does it appear that the computer store has been given laptops of lower than average quality?
Answers: 2
Mathematics, 21.06.2019 18:00, rosenatalie222
In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.
Answers: 1
Mathematics, 21.06.2019 19:30, gabby77778
[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible
Answers: 3
Mathematics, 21.06.2019 22:20, guesswhoitis21
Line segment eg is partitioned by point f in the ratio 1: 1. point e is at e (0, 4), and point f is at (1, 3). what are the coordinates of point g? (−1, 5) (2, 2) (3, 1) (4, 0)
Answers: 2
The manager of a computer retails store is concerned that his suppliers have been giving him laptop...
History, 19.09.2021 01:10
Mathematics, 19.09.2021 01:10
English, 19.09.2021 01:10
Social Studies, 19.09.2021 01:10
History, 19.09.2021 01:10