uses of frequency distribution

The owner of a restaurant recorded the number of visitors for a period of one week. Examine the nature of distribution of the data, using a box plot. 256, 542, 340, 460, 380, 429, 412 => symmetric or positively skewed or negatively skewed or approximately symmetric..

When should the t distribution be used to find a confidence interval for the mean? => When the sample size of population is greater than 30 and the standard deviation is known. or When the sample size of population is less than 30 and the standard deviation is known. or When the..

Use distributive property to simplify the expression 4(12 - n ). => 4 n - 48 or 3 - 4 n or 48 - 4 n or 48 n - 4..

Identify the incorrect statement(s). I. For an open-ended frequency distribution, Mean is the best average. II. Mean and Midrange are not effected by extremely high or low values in a data set. III. Bimodal is a data set with two modes. IV. Mode is the easiest average to compute..

The students of Environmental studies collected the data of the life span of Zebras from the zoological authorities which are as follows. 20, 12, 19, 22, 28, 30, 17, 25, 10, 23, 16, 18, 21, 32, 15, 14, 8, 22, 11, 13, 18, 20, 21, 19, 19 Find the average life span of a Zebra by constructing a fr..

Which among the following statement(s) is/are true about histograms? I. Midpoints are useful in determining class widths and class boundaries. II. Histograms are useful in displaying cumulative frequencies. III. Histograms are used to display categorical data..

The scores of 60 students of a class are shown in the frequency distribution. Scores Frequency 86 - 96 14 97 - 107 7 108 - 118 13 119 - 129 10 130 - 140 11 141 - 151 5 Find the mean and the modal class of the data. => 115 and 151 or 115.2 and 86 - 96 or 115.3 and 141 -..

The quiz scores of 50 students of a class is as shown in the frequency distribution. Quiz score Frequency 0 - 2 6 3 - 5 13 6 - 8 9 9 - 11 14 12 - 14 8 Find the variance and standard deviation. => 7.3 and 68.14 or 3.89 and 1.97 or 3.89 and 15.15 or 15.15 and 3.89..

The blood urea nitrogen (in milligrams per deciliter - mg/dl) count of 20 randomly selected patients is shown in the frequency distribution table. Blood urea nitrogen Frequency 11 - 13 3 13 - 15 4 15 - 17 3 17 - 19 5 19 - 21 5 Find the variance and standard deviation. ..

Say whether the normal distribution can be used as an approximation to the binomial distribution shown here. n = 20 and p = 0.8 => false or true or cannot be determined...