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
=
Answer:
The product of 60 and 4000 is 240,000
Step-by-step explanation:
If you are asked to work out the product of two or more numbers, then you need to multiply the numbers together.
Answer:
see explanation
Step-by-step explanation:
Since he answered 3 out of a 100 incorrectly, then he answered 97 out of a 100 correctly.
Percent means out of a 100, hence 97 out of a 100 as a percent is
= 97% = 0.97 as a decimal fraction
Answer:
3>-3
Step-by-step explanation:
make an open dot on 3 and make a line going towards the left.
For the answer it would be A
