Questions asked
The grades of 40 students are arranged in the following frequency distribution: \begin{tabular}{|l|c|c|c|c|c|} \hline Class limits & \( 50-59 \) & \( 60-69 \) & \( 70-79 \) & \( 80-89 \) & \( 90-99 \) \\ \hline Frequency & 5 & 3 & 15 & 6 & 11 \\ \hline \end{tabular} The first quartile is equal to: a. 74.5 b. 79.5 c. 70.83 d. 71.83 e. 83.25
The first quartile and the third quartile of a data set are 100 and 110 respectively. The inner fences of this data set are: a. \( (70,140) \) b. \( (90,120) \) c. \( (85,125) \) d. \( (-15,15) \)
For the following table, \begin{tabular}{cccccc} Class & \( \mathbf{4 1 - 4 5} \) & \( \mathbf{4 6 - 5 0} \) & \( \mathbf{5 1 - 5 5} \) & \( \mathbf{5 6 - 6 0} \) & \( \mathbf{6 1 - 6 5} \) \\ Frequency & 3 & 8 & 10 & 3 & 1 \end{tabular} The midpoint of the first class in the above table is: a. 48 b. 0.40 c. 42.5 d. 11 e. 43 f. 0.12
Time left 0:09:16 The following polygon shows the distribution of the time (in hours) people in a sample spent without drinking water in a specific ?day during an experiment. What is the mean time a. 8 b. 12 C. 14.4 d. 12.36
The mean and the median and the variance of a data set are 80 and 70 and 25 respectively, The Pearson's index of skewness is equal to: a. 2 b. 1.2 c. -6 d. 6
Two samples of the patients weights were measured and the following results obtained: \begin{tabular}{ccc} Sample & Size & Mean \\ 1 & 30 & 70 \\ 2 & 70 & \( x \) \end{tabular} If the two samples combined together and the combined mean is 63 , then the mean of the second sample \( \mathrm{x} \) is equal to: a. none of the choices b. 90 c. 80 d. 60 e. 74
The weights of 40 students are arranged in the following frequency distribution: \begin{tabular}{|l|c|c|c|c|c|} \hline Class limits & \( 50-59 \) & \( 60-69 \) & \( 70-79 \) & \( 80-89 \) & \( 90-99 \) \\ \hline Frequency & 5 & 7 & 15 & 8 & 5 \\ \hline \end{tabular} The first quartile is equal to: a. 83.25 b. 69.5 c. 66.64 d. 64.5 e. 71.83
The mean and the variance for the grades of the students in a certain section are 70 and 25 respectively. At least percent of the grades lie between 50 and 90 is equal : a. \( \frac{3}{4} \) b. \( \frac{15}{16} \) c. \( \frac{8}{9} \) d. \( \frac{1}{4} \) e. none of the choices
Example 5: The GPA are listed for 24 selected students. \begin{tabular}{llllllllllll} 63.1 & 67.1 & 70.0 & 71.0 & 72.5 & 73.6 & 75.7 & 76.6 & 78.1 & 79.8 & 81.6 & 82.8 \\ 83.2 & 83.7 & 85.3 & 86.7 & 87.0 & 87.7 & 88.3 & 88.8 & 90.0 & 91.9 & 93.1 & 98.2 \end{tabular} Construct a frequency distribution with 6 classes.
