In: Statistics and Probability
A. A population of values has a normal distribution with
μ=12.8μ=12.8 and σ=7σ=7. You intend to draw a random sample of size
n=11n=11.
Find the probability that a single randomly selected value is less
than 12.
P(X < 12) = Incorrect
Find the probability that a sample of size n=11n=11 is randomly
selected with a mean less than 12.
P(M < 12) =
B. A manufacturer knows that their items have a lengths that are
skewed right, with a mean of 7.6 inches, and standard deviation of
1.1 inches.
If 39 items are chosen at random, what is the probability that
their mean length is greater than 7.8 inches?
c. You measure 49 watermelons' weights, and find they have a
mean weight of 45 ounces. Assume the population standard deviation
is 2.8 ounces. Based on this, construct a 90% confidence interval
for the true population mean watermelon weight.
Give your answers as decimals, to two places
please do it step by step including the formula. which table we have to use
thanks