Please help with the statistics questions. Not sure why my answers are wrong. Please help.

. Caught warning in the question code: Cannot use a scalar value as an array on line 5 in file /var/app/current/assess2/questions/QuestionHtmlGenerator.php(19 Business Weekly conducted a survey of graduates from several top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is $146,000. Assume the standard deviation is $43,000. Suppose you take a simple random sample of 16 graduates. Round all answers to four decimal places if necessary. . What is the standard deviation of distribution of X? . What is the standard deviation of X? . For a single randomly selected graduate, find the probability that her salary is between $130,075 and $139,350. . For a simple random sample of 16 graduates, find the probability that the average salary is between $130,075 and $139, 350. . For part d), is the assumption of normal necessary? O NoO Yes Submit