Entries by Grace Wahito

The mean incubation time for a type of fertilized egg kept at 100.7

The mean incubation time for a type of fertilized egg kept at 100.7°F is 20 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 11 day. (a) What is the probability that a randomly selected fertilized egg hatches in less than 18 days? (b) What is the probability that a randomly selected […]

 

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The amounts a soft drink machine is designed to dispense for each drink

The amounts a soft drink machine is designed to dispense for each drink are normally distributed, with a mean of 11.9 fluid ounces and a standard deviation of 0.3 fluid ounce. A drink is randomly selected. (a) Find the probability that the drink is less than 11.7 fluid ounces. (b) Find the probability that the drink is […]

 

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Find the probability and interpret the results

Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $62,000. A random sample of 45 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $59,000? Assume sigma = $6,400. […]

 

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The mean height of women in a country (ages20-29) is 64.3 inches

The mean height of women in a country (ages20-29) is 64.3 inches. A random sample of 75 women in this age group is selected. What is the probability that the mean height for the sample is greater than 65 inches? Assume sigma =2.78. The probability that the mean height for the sample is greater than 65 inches is?   Looking […]

 

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