Answer:
z-test.
Step-by-step explanation:
We want to perform an hypothesis test for a population mean.
In the case that the <u>standard deviation of the population is known</u> and the population distribution is normal, even if the sample is small, <u>we will use a z-test</u>.
The usual case is to not know the standard deviation of the population, in which case a t-test is adequate instead of a z-test, taking into account the degrees of freedom of the sample.
This is independent as he is picking up cards randomly.
Answer:
6hrs
Step-by-step explanation:
because 4-2hrs 4x3=12 so it's 8
and it's fall guys
When we see
has only 1 soulution
because its range is [0,π]
so only one solution exist at π/2
