Statistics homework HELP

Posted on 2014-03-25 07:06:00 in Statistics by RICKY

The amount of fill (weight of contents) put into a glass jar of spaghetti sauce is normally distributed with mean ? = 843 grams and standard deviation of ? = 12 grams.

(a) Describe the distribution of x, the amount of fill per jar.



skewed right?



normal?



skewed left?



chi-square?





(b) Find the probability that one jar selected at random contains between 835 and 858 grams. (Give your answer correct to four decimal places.)



(c) Describe the distribution of x, the mean weight for a sample of 25 such jars of sauce.



skewed right?



normal?



skewed left?



chi-square?





(d) Find the mean of the x distribution. (Give your answer correct to the nearest whole number.)





(ii) Find the standard error of the x distribution. (Give your answer correct to two decimal places.)





(e) Find the probability that a random sample of 25 jars has a mean weight between 835 and 858 grams. (Give your answer correct to four decimal places.)





You may need to use the appropriate table in Appendix B to answer this question.

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