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Author Question: A population has a mean of 80 and a standard deviation of 7 . A sample of 49 observations will be ... (Read 110 times)

mwit1967

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on: Jun 24, 2018
A population has a mean of 80 and a standard deviation of 7 . A sample of 49 observations will be taken. The probability that the mean from that sample will be larger than 82 is _____.
 a. .5228
  b. .9772
  c. .4772
  d. .0228

Question 2

Ralph's Gas Station is running a giveaway promotion. With every fill-up of gasoline, Ralph gives out a lottery ticket that has a 25 chance of being a winning ticket. Customers who collect 4 winning lottery tickets are eligible for the BIG SPIN for large payoffs. What is the probability of qualifying for the big spin if a customer fills up: (a) 3 times; (b) 4 times; (c) 7 times?


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moormoney

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Reply #1 on: Jun 24, 2018
Answer to Question 1

d

Answer to Question 2

a . 0
b. .0039
c. .0705


mwit1967

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Reply 2 on: Jun 24, 2018
Gracias!

pangili4

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Reply 3 on: Yesterday
Wow, this really help

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