Answer asap! Need help before I go to sleep.
1 answer:
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Answer:
0.28
Step-by-step explanation:
To know the probability we first need to know the total number of choices for each character in the license plate. Since there are a total of 10 possible numbers (0-9) and 26 letters in the English Alphabet. Then this means that each character has a total of 36 possible choices. Out of these 36 only 10 are numbers, therefore the probability of the first character being a number is
or 0.2777
If we rounded the decimal to the nearest hundredth it would be 0.28
Answer:
decrease of 80%
Step-by-step explanation:
See image.
Use variables for the fraction.
Numerator means the top number.
Denominator means the bottom number.
Change percents to decimals to calculate.
.8 is 80%.
80% will make the whole fraction smaller.
see image
Answer:
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
=