Blood pressure: High blood pressure has been identified as a risk factor for heart attacks and strokes. The proportion of U.S. adults with high blood pressure is  0.4 . A sample of  41  U.S. adults is chosen. Use the TI-84 Plus Calculator as needed. Round the answer to at least four decimal places. Part: 0 / 6 0 of 6 Parts Complete   Part 1 of 6     Is it appropriate to use the normal approximation to find the probability that more than  44%  of the people in the sample have high blood pressure? It ▼(Choose one) appropriate to use the normal curve, since  =np  ▼(Choose one) 10 and  =n−1p  ▼(Choose one)  10 .

Question 5 You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 68.1. You would like to be 99% confident that your estimate is within 4 of the true population mean. How large of a sample size is required? Round up to nearest whole number. n = Question Help: Video Written Example Message instructor Submit Question

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Unit 3, Topic 12, Exercise 12-23 Ultra-High IQ Scores The widely used Stanford-Binet IQ test has a mean of 100 points and standard deviation of 15 points. Assume that the population of IQ scores on this test are normally distributed. a. The minimum score for entry into Mensa, a group for people with high IQs, is 138. Determine the proportion of this population who are eligible to join Mensa. Round your answer to four decimal places. b. Another high-IQ group known as the Triple Nine Society requires an IQ score at or above the 99.9 th percentile, so that only the top U.1% of IQ scores in the population are eligible. Determine the minimum IQ score required to join the Triple Nine Society. Round your answer to one decimal place. c. Marilyn vos Savant, author of the "Ask Marilyn" column in Parade magazine, is reported to have an IQ score of 228. How many standard deviations above the mean is this? Round your answer to two decimal places. standard deviations

Pag 73°F Partly sunny A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in Texas and Indiana. Due to recent trends in the childcare industry, the firm suspects that the mean annual income of childcare workers in Texas is less than the mean annual income of childcare workers in Indiana. To see if this is true, the firm selected a random sample of 10 childcare workers from Texas and an independent random sample of 10 childcare workers from Indiana and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars Texas 35102, 40287, 32854, 29080, 36394, 22024, 22493, 31602, 27434, 40040 Indiana 38446, 33018, 38027, 43504, 37962, 33838, 35730, 36793, 37714, 25715 HD 144Hz Send data to calculator V The population standard deviation for the annual incomes of childcare workers in Texas and in Indiana are estimated as 6200 and 6500, respectively. It is also known that both populations are approximately…

Calcium levels in people are normally distributed with a mean of 9.7 mgdL and a standard deviation of 0.5 mgdL . Individuals with calcium levels in the bottom 10% of the population are considered to have low calcium levels. Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.

I'm not sure where is my mistake solving this problem.  I have revised my calculation three times already and I'm not sure if the step to solve it is wrong or if it is my rounding the problem.   Thank you for your help