Answer:
17
Step-by-step explanation:
- 38 - 21 = 17
- 21 - 4 = 17
- The difference between each pair of numbers above is 17, so that is the common difference.
I hope this helps!
Answer:
Try doing 4 eleven one half
Step-by-step explanation:
I not good at this sry
Answer:
68.2% of the batteries failed between 17.8 and 20.2 hours.
95.44% of the batteries failed between 16.6 and 21.4 hours.
99.97% of the batteries failed between 15.4 and 22.6 hours.
Step-by-step explanation:
The 68-95-99.7 states that, for a normally distributed sample:
68.26% of the measures are within 1 standard deviation of the sample.
95.44% of the measures are within 2 standard deviations of the sample.
99.97% of the measures are within 3 standard deviations of the sample.
In this problem, we have that:
Mean of 19 hours, standard deviation of 1.2 hours.
About 68.26% of the batteries failed between what two values?
This is within 1 standard deviation of the mean. So 68.2% of the batteries failed between 17.8 and 20.2 hours.
About 95.44% of the batteries failed between what two values?
This is within 2 standard deviations of the mean. So 95.44% of the batteries failed between 16.6 and 21.4 hours.
About 99.97% of the batteries failed between what two values?
This is within 3 standard deviations of the mean. So 99.97% of the batteries failed between 15.4 and 22.6 hours.
That's very interesting. I had never thought about it before.
Let's look through all of the ten possible digits in that place,
and see what we can tell:
-- 0:
A number greater than 10 with a 0 in the units place is a multiple of
either 5 or 10, so it's not a prime number.
-- 1:
A number greater than 10 with a 1 in the units place could be
a prime (11, 31 etc.) but it doesn't have to be (21, 51).
-- 2:
A number greater than 10 with a 2 in the units place has 2 as a factor
(it's an even number), so it's not a prime number.
-- 3:
A number greater than 10 with a 3 in the units place could be
a prime (13, 23 etc.) but it doesn't have to be (33, 63) .
-- 4:
A number greater than 10 with a 4 in the units place is an even
number, and has 2 as a factor, so it's not a prime number.
-- 5:
A number greater than 10 with a 5 in the units place is a multiple
of either 5 or 10, so it's not a prime number.
-- 6:
A number greater than 10 with a 6 in the units place is an even
number, and has 2 as a factor, so it's not a prime number.
-- 7:
A number greater than 10 with a 7 in the units place could be
a prime (17, 37 etc.) but it doesn't have to be (27, 57) .
-- 8:
A number greater than 10 with a 8 in the units place is an even
number, and has 2 as a factor, so it's not a prime number.
-- 9:
A number greater than 10 with a 9 in the units place could be
a prime (19, 29 etc.) but it doesn't have to be (39, 69) .
So a number greater than 10 that IS a prime number COULD have
any of the digits 1, 3, 7, or 9 in its units place.
It CAN't have a 0, 2, 4, 5, 6, or 8 .
The only choice that includes all of the possibilities is 'A' .
