What is the probability of randomly selecting a score less than X = 52?

P(X < 52) =

 

What is the probability of selecting a random sample of n = 9 scores with a mean less than M = 52?

P(M < 52) =

(Look at photo)

 

What is the probability of selecting a random sample of n = 16 scores with a mean less than M = 52?

P(M < 52) =

(1) Suppose IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability a random sample of 1200 people has a mean IQ of less than 99?

Suppose IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability a random sample of 150 people has a mean IQ between 102 and 103?

Suppose IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability a random sample of 100 people has a mean IQ of more than 104?

A standard deck of playing cards contains 52 cards.One card is selected from the deck.

(a) Compute the probability of randomly selecting a club or spade?

(b) Compute the probability of randomly selecting a club, spade or heart?

(c) Compute the probability of randomly selecting a three or spade?