Days and standard deviation days.
The duration of the pregnancy of a certain breed of cow is normally distributed. with mean days and standard deviation days. On y 2.50 0 of all pregnancies. are shorter than 235 days and 150 0 are longer than 286 days. Only 1% of the components have a life span less than 3500 hours and. 2.500 have a life span greater than 5500 hours. (b) Determine the mean and standard deviation of the life spans of the components. (6). The company gives warranty of 4000 hours on The daily milk production of Guernsey cows is approximately normally distributed with a mean of 35 kg/day and a standard deviation of 6 kg/day. What is the probability that a day’s production for a single animal will be less than 28 kg? 17. Life tests indicated that the mean mileage is 47,900, and standard deviation of the normally distributed distribution of mileage is 2,050 miles. The factory wants to set the guaranteed mileage so that no more than 5% of the tires will have to be replaced. What guaranteed mileage should the factory announce? 2. Cattle with long gestation lengths generally give birth to large calves, since the fetus is growing fastest at the end of gestation. A 278-day gestation usually results in a smaller, lighter calf (in the same breed and type of animal) than a calf carried 288 days or longer. When a cow calves 10 days or two weeks late (and has a big calf and a hard birth), she’s losing that amount of time to recover and rebreed. So I started looking for bulls that sired calves with shorter gestation so I could get my cows bred back on time,” he says. Cows must be milked every 12 hours, or two times a day. Dairy cows are usually wedge-shaped with their rear (udder) end much broader than their front end. Can you see why this is a good body shape for milking? The lactation period, or the length of time a cow can produce milk before having another calf, is 305 days. In 305 days, a good dairy cow can produce 2,326 gallons or 20,000 pounds or 37,216 glasses of milk! A company produces electrome components which have life spans that are normally. distributed. Only 1% of the components have a life span less than 3500 hours and. 2.500 have a life span greater than 5500 hours. (b) Determine the mean and standard deviation of the life spans of the components. (6). The company gives warranty of 4000 hours on the components. The time required to assemble an electronic component is normally distributed with a mean of 12 minutes and a standard deviation of 1.5 min. Find the probability that a particular assembly takes more than 14.25 minutes. 13. The height of an adult male is known to be normally distributed with mean of 175 cm and standard deviation 6 cm. Life tests indicated that the mean mileage is 47,900, and standard deviation of the normally distributed distribution of mileage is 2,050 miles. The factory wants to set the guaranteed mileage so that no more than 5% of the tires will have to be replaced. What guaranteed mileage should the factory announce? 2. We have then two sets of values (x,z) which we substitute into the equation then solve the simultaneous equations. Example: The duration of the pregnancy of a certain breed of cow is normally distributed with mean days and standard deviation days. Only 2.5% of all pregnancies are shorter than 235 days and 15% are longer than 286 days. Find and. Sometimes it happens that we know a population is normally distributed but we don’t have a full set of data and so cannot find the mean and standard deviation from a set of readings. However, given JUST TWO suitable statistics we can find the mean and standard deviation of a list. If cows are in good body condition at calving, then the PPI would be in the 45 to 50 day range and if in poor condition, the PPI would be longer. First-calf heifers have a longer PPI compared to mature cows, about 10 days longer if she has no calving difficulty and is in good body condition. So with all that in mind, the postpartum interval, if conditions are ideal, for beef cows is between 50 and 60 days for an average of 55 days. First-calvers will be at least 10 days longer. After the egg is fertilized by a sperm and then implanted in the lining of the uterus, it develops into the placenta and embryo, and later into a fetus. Pregnancy usually lasts 40 weeks, beginning from the first day of the woman's last menstrual period, and is divided into three trimesters, each lasting three months. 
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the duration of the pregnancy of a certain breed of cow is normally distributed with mean