Question: It is estimated that amounts of money spent on gasoline by customers at a gas station follow a normal distribution with a standard deviation of $2.50. It is also found that ten percent of all customers spent more than $25. Find the percentage of customers spent less than USD 20?

Find the probability that a randomly chosen subscription : Find the probability that a randomly chosen subscription |

Calculate the conditional probability : Calculate the probability that a person for whom the test result is positive has the disease |

Probability problems based on normal distribution : Probability problems based on normal distribution |

Find percentage of members spends more than $140 in a year : Find the percentage of members spends more than $140 in a year? |

Find the percentage of customers spent less than $20 : Find the percentage of customers spent less than $20 |

Find probability that fewer than 500will refuse to cooperate : A market research organization has found that 40 percent of all supermarket shoppers refuse to cooperate when questioned by its pollsters. If 1,000 shoppers are approached, Find the probability that fewer than 500 will refuse to cooperate? |

Calculate the value the test statistic : Calculate the value the test statistic |

Compute the test value : Compute the test value |

The difference exists between the mean number : The difference exists between the mean number |

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## Find the probability of eventDetermine the probability of event A given that event B is already occurred |

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