Find the standard deviations of sample data summarized in the frequency distribution table below by using the formula below, where x represents
the class midpoint represents the class frequency and n represents the total number of sample values. also, compare the computed standard
deviation to the standard deviation obtained from the original list of data values. 11.1.
nin-1)
interval
frequency
30-36
37-43
44-50
51-57
592
557
standard deviation =
round to one decimal place as needed

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?