Songs on iTunes have a mean length of 3.54 minutes with a standard deviation of 0.25 minute? If the distribution of song lengths follows a normal distribution, what percentage of songs are
shorter than 4 minutes
between 4.4 and 4.6 minutes?
Songs on iTunes have a mean length of 3.54 minutes with a standard deviation of 0.25...
A large playlist consists of songs with times which have mean 4 minutes and standard deviation 10 seconds. a.) A simple random sample of 64 songs is selected. What is the mean of the total length of the 64 songs, in minutes? 256 ER! 以前的尝试 RÉJITED 159-9066 b.) If as above 64 songs were randomly selected, what is the standard deviation of the total length of the songs, in minutes? (Give decimal answer to two places past decimal.) 1.3300 ES!...
A manufacturing process makes rods that vary slightly in length but follow a normal distribution with mean length 25 cm and standard deviation 2.60. What is the probability of randomly selecting a rod that is shorter than 22 cm? P(X<22)=P(Z< ) = Round your z-score and probability to four decimal places. The time a song plays on the radio varies from song to song. The time songs play varies according to a normal distribution with mean of 3.2 minutes and a...
The lengths of the sardines received by a cannery have a mean of 4.64 inches and a standard deviation of 0.25 inch. If the distribution of these lengths can be approximated closely with a normal distribution, what percentage of all these sardines are (a) shorter than 4.00 inches; (b) from 4.40 to 4.80 inches long?
A machine produces bolts with mean length 4 mm and a standard deviation of 0.3 mm. Bolts are measured and any which are shorter than 3.5 mm or longer than 4.4 mm are rejected. Calculate the proportion of bolts that are rejected. You are to assume the lengths are Normally distributed.
The length of conversations between supervisors and workers in a certain manufacturing industry is normally distributed with a mean of 4.0 minutes and a standard deviation of 0.8 minutes. a. Use the normal curve table to determine the percentage of conversations given the times provided and illustrate your answers with sketches of the normal distribution: 1. Longer than 4.4 minutes 2. Shorter than 2 minutes.
The length of time it takes college students to find a parking spot in the library parking lot follows anormal distribution with a mean of 5.5 minutes and a standard deviation of 1 minute. Find theprobability that a randomly selected college student will take between 4.0 and 6.5 minutes to find aparking spot in the library lot.
The length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution with a mean of 4.0 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will take between 2.5 and 5.0 minutes to find a parking spot in the library lot.
The length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution with a mean of 7 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will find a parking spot in the library parlong lot in less than 6.5 minutes.0.2674 0.3551 0.1915 0.3085
If the length of easy listening songs has mean 148 seconds and standard deviation 32 seconds, then the probability that a random selection of 23 songs will have mean length of 143.18 seconds or less is O 0.235 O 0.4301 O 0.6252 O 0.1528
a. Time to finish a quiz in minutes follows a normal distribution with mean 6 and standard deviation .7. A student took 4.8 minutes. What is this student’s z-score? b. Time to finish a quiz in minutes follows a normal distribution with mean 6 and standard deviation .7. What proportion of students complete the quiz in less than 5.2 minutes? Use the normalcdf command on your calculator with 6 as the mean, .7 as the standard deviation, a very large negative...