Answer:
Mean 105
Standard deviation 1.89
Step-by-step explanation:
The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation , the sample means with size n of at least 30 can be approximated to a normal distribution with mean and standard deviation
In this problem, we have that:
If the sample size is n 81, find the mean and standard deviation of the distribution of sample means.
By the Central limit theorem
mean 105
Standard deviation
Answer:
La respuesta podría ser 80000 y en cualquier momento.
x ,y are the numbers
x = 5y-3
x+y = 27
substitute first equation into the second
(5y-3) +y =27
combine like terms
6y-3=27
add 3 to each side
6y=30
divide by 6
y=5
x = 5y-3
x=5*5-3
x=22
the two numbers are 22 and 5
Answer: It will take 3.75 hours to reach 20°C.
Solution:
The bottle temperature begins at the freezer temperature of –16° C
How many hours will it take to reach 20° C?
Change in temperature=20°C – (–16°C)
Change in temperature=20°C+16°C
Change in temperature=36°C
The bottle temperature will go up a steady 9.6° C every hour. Using a rule of three:
9.6°C → 1 hour
36°C → x
x=(36°C)(1 hour)/(9.6°C)
x=3.75 hours
Answer: It will take 3.75 hours to reach 20°C.