3 years ago

Simplify the expression -15m + 9m

Mathematics

1 answer:

natima [27]3 years ago

8 0

Answer:

-6M

Step-by-step explanation:

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Suppose a simple random sample of size nequals=6464 is obtained from a population with mu equals 84μ=84 and sigma equals 16σ=16.

Assoli18 [71]

Answer:

a. $\bar X$ is distributed $N(84;4)$

b. $P(\bar X \geq 87.6) = 0.03593$

c. $P(\bar X \leq 79.2) = 0.00820$

d. $P(\79.2 \leq \bar X \leq 87.6) = 0.95587$

Step-by-step explanation:

The central limit theorem states that, for large n, the sampling distribution of the sample mean is approximately normal with mean $\µ$ and variance $\frac{\sigma^2}{n}$ , then, the sample mean is distributed as a normal random variable with means $\mu_{\bar X}=\mu=84$ and variance $\sigma^2_{\bar X}=\frac{\sigma^2}{n}=\frac{16^2}{64}=4$ .