A survey indicates that for each trip to the supermarket, a shopper spends an average of...
People from Missouri spends an average of 49 minutes with an STD (Standard Deviation) of 12 minutes in a grocery store (normally distributed). Find the probability that the shopper will be in the store for more than 52 minutes? (Draw the normal curve with labels and shade the appropriate area)
A study of the time spent shopping in a supermarket for 20 specific items showed an approximately uniform distribution between 25 minutes and 45 minutes. a. What is the probability that the shopping time will be between 31 and 38 minutes? b. What is the probability that the shopping time will be less than 39 minutes? c. What are the mean and standard deviation of the shopping time?
The average time a visitor spends at the Renzie Park Art Exhibit is 62 minutes. The standard deviation is 12 minutes. If a visitor is selected at random, find the probability that he or she will spend:A)At least 82 minutes at the exhibitB)At most 50 minutes at the exhibitThe average time a person spends at Barefoot Landing Seaquarium is 96 minutes. The standard deviation is 17 minutes. Assume the variable is normally distributed. If a visitor is selected at random,...
A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. Complete parts (a) through (d) below. a. What is the probability that an 18- to 24-year-old spends less than 120 minutes watching video on his or her smartphone per month? The probability that an...
According to an NRF survey conducted by BIGresearch, the average family spends about $237 on electronics (computers, cell phones, etc.) in back-to-college spending per student. Suppose back-to-college family spending on electronics is normally distributed with a standard deviation of $54. If a family of a returning college student is randomly selected, what is the probability that: (a) They spend less than $160 on back-to-college electronics? (b) They spend more than $340 on back-to-college electronics? (c) They spend between $120 and...
13 . According to the American Time Use Survey, the typical American spends 154.8 minutes per day watching television. A survey of 50 Internet users results in a mean time watching television per day of 128.7 minutes, with a standard deviation of 46.5 minutes. Using 0.05 level of significance to test the claim that Internet users spend less time watching television. 14. College math instructors suggest that students spend 2 hours outside class studying for every hour in class. So,...
1. A national study finds that a US adult spends an average of 48 minutes a day on the phone with a standard deviation of 9 minutes. This data is normally distributed. a) Find the probability that a randomly selected US adult spends more than 60 minutes on the phone a day. b) Find the probability that a randomly selected US adult spends between 32 and 40 minutes on the phone each day. Zina includes her answer below. What went wrong? P(z < -.89) =...
A Normal random variable X has mean 20 and standard deviation 4. Calculate the probability that specific values of X exceed 26. Calculate the 36th percentile of a Standard Normal random variable. A Standard Normal random variable Z falls within an interval of values centered around zero, that is the interval -z to z, with probability 0.6. Calculate the value of z that defines that interval. A truck makes daily round trips between Charlotte and Atlanta. On 30 percent of...
What is the age distribution of promotion-sensitive shoppers? A supermarket super shopper is defined as a shopper for whom at least 70% of the items purchased were on sale or purchased with a coupon. Age range, years 18-28 29-39 40-50 51-61 62 and over Midpoint x 23 34 45 56 67 Percent of super shoppers 9% 40% 26% 12% 13% For the 62-and-over group, use the midpoint 67 years. (a) Using the age midpoints x and the percentage of super...
A Nielsen study indicates that mobile subscribers between 18 and 24 years of age spend a substantial amount of time watching video on their devices, reporting a mean of 396 minutes per month. Assume that the amount of time watching video on a mobile device per month is normally distributed and that the standard deviation is 50 minutes What is the probability than and 18-24 year old mobile subscriber spends less than 321 minutes watching a video on his or...