(1) The first quartile of the values \( 42,35,63,7,28,21,4 \) is \( \quad(28,7,14,6 \) (c) Which of the following is divisible by 2,3 and \( 5 ? \) (4) The mean of \( 3,7,4,6, k \) is 5 then \( k=1 \)

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.

What is a scatter plot?

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: \( \begin{array}{ll}\text { (a) } 19.36 \% & \text { (b) } 90.32 \% \\ \text { (c) } 9.68 \% & \text { (d) None of these }\end{array} \)

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