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Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students averaged 8.46 hours of sleep, with a standard deviation of 2.44 hours. Assume that the number of hours of sleep for these visually impaired students is normally distributed.
a) What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
b) What is the probability that a visually impaired student gets between 6.7 and 10.65 hours of sleep?
c) Thirty percent of students get less than how many hours of sleep on a typical day?
The probability that the daily demand at this store is at least one and at most three is:
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
By using the maximax criterion, what decision should be made by the decision maker?
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
If one person is selected at random, what is the probability that person is Female?
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
The null hypothesis is that the distribution of mother's educational level is the same for both treatment groups. The value of the chi-square statistic is 7.422. Evaluate the P-value
The choices are to be designated by the letter a, b, c, d, and e. The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question. Using the number correspondence 1 for a, 2 fo..
the maximum point total for the quarter was 200. The point totals for the 10 students are given in the stemplot below. For the density curve displayed below, which of the following is true?
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
If student is chosen at random, determine the probability that he or she is sophomore and owns a credit card.
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