Условие задания: стандартное отклонение равно 6, средний квадрат значений равен 98,7. Найди среднеє арифметическое. Рассмотри два варианта по значению средне арифметического с округлением до десятых. Наименьшее среднее арифметическое:

Min bagi satu set data yang mengandungi tujuh integer \( 28,27,16,30 \), The mean of a set of data of seven integers \( 28,27,16,30, k, 26 \) and \( k \) - (a) Cari nilai \( k \). Find the value of \( k \). (b) Nyatakan kuartil pertama bagi set data tersebut. State the first quartile of the set of data. Cari nombor yang dikeluarkan itu. One number is removed from the set of data and the mean remains Find the number removed.

On an examination the average grade was 74 and the standard deviation was 7 . If \( 10 \% \) of the class are given A's and the distribution of grades is to follow a normal distribution. Then the lowest possible A and highest possible B if z.10=1.28 is: \( \begin{array}{ll}\text { (a) } 83 \text { and } 82 & \text { (b) } 84 \text { and } 83 \\ \text { (c) } 85 \text { and } 84 & \text { (d) } 82 \text { and } 81\end{array} \)

If a set of observations is normally distributed, then the percentage of observations differs from mean by more than \( 1.3 \sigma \) is: \( \begin{array}{ll}\text { (a) } 19.36 \% & \text { (b) } 90.32 \% \\ \text { (c) } 9.68 \% & \text { (d) None of these }\end{array} \)

\( A \) is students who learn English. \( B \) is students who learn french. \( C \) is students who learn Khmer. \( n A \) is \( 18, n B \) is \( 18, n C \) is \( 26, n A n C \) is \( 13, n B n C \) is \( 11, n A n B n C \) is \( 6, n A u B u C \) is 35. How many students learn french and English?

El valor que falta para que sea la mediana aritmética de los siguientes datos: \( 100, \square, 300 \) \begin{tabular}{|l|}400 \\ 350\end{tabular} 50.200