The distribution of SAT scores is normally distributed with a μ = 500 and a σ = 100.  a, What proportion of scores would be less than 400?  b. What proportion of scores would be greater than 650?  c. What score cuts off the 80th percentile (or top 20%)  d. If a college requires scores in the top 40%, what is the minimum score a person would need to be accepted?

Identify the level of measurement of the data , and explain what is wrong with the given calculation.In a set of data , blood lead levels are represented as 1 for low , 2 for medium , and 3 for high . The average ( mean ) of the 642 blood lead levels is 1.3

A survey of 100 fatal accidents showed that 26 were alcohol related. Find a point estimate for p, the population proportion of accidents that were alcohol related. O A. 0.351 ОВ. 0.74 O C. 0.206 O D. 0.26

-Ensure complete frequency table and histogram using the values below. -Convert the frequencies into percentages and record in the‘%’column. Using the formula Percentage formula= count/total x 100 A sample is provided beside the values

I need help explaining parts a and b.

Do men take less time than women to get out of bed in the morning? The 42 men observed averaged 7.6 minutes to get out of bed after the alarm rang. Their standard deviation was 2.2. The 52 women observed averaged 9 minutes and their standard deviation was 2.1 minutes. What can be concluded at the a = :0.01 %3D level of significance?

If A = 0.5, find the P(X = 0). Use the editor to format your answer Question 3 In a random sample of 74 people, 38 are classified as "successful" a. Determine the sample proportion, p, of successful people. b. If the population proportion is 0.80, determine he standard error of the proportion. Use the editor to format your answer

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Statistics Question

Assume critical reading scores for a standardized test are distributed as ​N(570​, 50​). Complete parts​ (a) through​ (d) below.       a. Find the test score at the 75th percentile.   The 75th percentile is nothing. ​(Round to the nearest integer as​ needed.) b. Find the test score at the 25th percentile.   The 25th percentile is nothing. ​(Round to the nearest integer as​ needed.) c. Find the interquartile range for test scores.   The interquartile range is nothing. ​(Round to the nearest integer as​ needed.) d. Is the interquartile range larger or smaller than the standard​ deviation?   The interquartile range is ▼   smaller larger than the standard deviation.