KadaLearns
31.05.2020 •
Mathematics
A keyboard is originally priced at $140. The online retailer gives a discount and the keyboard is now priced at $77. Enter the percentage discount for the cost of the keyboard.
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Ответ:
Step-by-step explanation:
given that certain tubes manufactured by a company have a mean lifetime of 800 hours and a standard deviation of 60 hours.
Sample size n =16
Std error of sample mean =
x bar follows N(800, 15)
the probability that a random sample of 16 tubes taken from the group will have a mean lifetime
(a) between 790 and 810 hours,
=
(b) less than 785 hours
, (c) more than 820 hours,
(d) between 770 and 830 hours
=