Calculate the mean and the standard deviation of thejollowing series :MarksNo. of studentsMore than 0100'» 109020» 30" 40» 50,,75502515» 60570,,ミ:::: :::

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Answered: Calculate the mean and the standard…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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th A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, µ, of babies born during the 24"" week of the gestation period. She plans to select a random sample of birth weights of such babies and use the mean of the sample to estimate u. Assuming that the population of th birth weights of babies born during the 24"" week has a standard deviation of 2.6 pounds, what is the minimum sample size needed for the scientist to be 95% confident that her estimate is within 0.5 pounds of µ? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.) Continue Submit As
Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 46 minutes and standard deviation 22 minutes. A researcher observed 6 students who entered the library to study. Round all answers to 4 decimal places where possible. What is the distribution of XX? ~ N( , ) What is the distribution of ¯xx¯? ~ N( , ) What is the distribution of ∑x∑x? ~ N( , ) If one randomly selected student is timed, find the probability that this student's time will be between 41 and 50 minutes. ___________________
Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 42 minutes and standard deviation 22 minutes. A researcher observed 18 students who entered the library to study. Round all answers to 4 decimal places where possible. What is the distribution of XX? XX ~ N(,) What is the distribution of ¯xx¯? ¯xx¯ ~ N(,) What is the distribution of ∑x∑x? ∑x∑x ~ N(,) If one randomly selected student is timed, find the probability that this student's time will be between 40 and 47 minutes. For the 18 students, find the probability that their average time studying is between 40 and 47 minutes. Find the probability that the randomly selected 18 students will have a total study time more than 684 minutes. For part e) and f), is the assumption of normal necessary? -No -Yes The top 10% of the total study time for groups of 18 students will be given a sticker that says "Great dedication". What is the least total time that a group…
A population has a mean p= 160 and a standard deviation o=22. Find the mean and standard deviation of the sampling distribution of sample means with sample size n= 45. The mean is H- = |, and the standard deviation is o- = (Round to three decimal places as needed.)
The marks obtained in mathematics by 1000 students are normally distributed, with mean 78% and standard deviation 11%. Determine (i) How many students got marks above 90% (ii) What was the highest mark obtained by the lowest 10% of the students?
The time it takes me to wash the dishes is uniformly distributed between 7 minutes and 16 minutes. What is average time that takes me to wash the dishes? What is the standard deviation of the time that takes me to wash the dishes?
If there are between 30 and 50 800 units in a normal distribution with a mean of = 40 and standard deviation= 7 allhow many units are there in the distribution?
The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 266 days and a standard deviation of 16 days. What proportion of all pregnancies will last between 240 and 270 days. (b) 0.5471 (d) 0.6875 (a) 0.8674 (c) 0.9876 Answer:
Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 48 minutes and standard deviation 23 minutes. A researcher observed 14 students who entered the library to study. Round all answers to 4 decimal places where possible. What is the distribution of XX? XX ~ N(,) What is the distribution of ¯xx¯? ¯xx¯ ~ N(,) What is the distribution of ∑x∑x? ∑x∑x ~ N(,) If one randomly selected student is timed, find the probability that this student's time will be between 42 and 50 minutes

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Calculate the mean and the standard deviation of the jollowing series : Marks No. of students More than 0 100 » 10 90 20 » 30 " 40 » 50 ,, 75 50 ,, 25 15 » 60 5 70 ,,