Q.104 HWV \( 60 \% \) of the students in a school are boys and the rest are girls. If \( 20 \% \) boys fail in the examination and \( 65 \% \) girls pass, then find the percentage of total number of students who passed.

4. The masses in kilograms of patients who attended a clinic on a cerain day were recorded \[ \begin{array}{l} \text { as: } 3852464860596273495449415758697260584241 \end{array} \] a) starting with elass \( 35-39 \), make a frequency distribution table for the data indicating the class and frequency. ( 3 marks) b) state the modal class (1 mark) c) Calculate the mean mass (3 marks) d) Calculate the median mass (3 marks)

Each student at a school has a student identification number. Counselors have a computer generate 50 random identification numbers, and the students associated with those numbers are asked to take a survey. What type of sample is this? Choose 1 answer: (A) Simple random sample (B) Stratified random sample (C) Cluster random sample (D) Systematic random sample () None of the above

12. If \( \sigma=3 \) be the null hypothesis then which one of the following is left sided alternative hypothesis- \( \begin{array}{llll}\text { i) } \sigma+3 & \text { ii) } \sigma<3 & \text { iii) } \sigma>3 & \text { iv) } \sigma=4\end{array} \)

Distribuição de Frequência Exemplo: Uma sala de aula possui 30 alunos, sendo que a idade do mais novo é de 18 anos e do mais velho é 50 anos. Estes alunos estão dispostos em uma tabela, referente a sua idade, da seguinte maneira: (Utilize log \( 30=1,48 \) ) \[ \begin{array}{l}28,25,19,22,44,50,22,25,33,20 \text {, } \\ 18,19,21,35,48,24,32,26,33,40 \\ 42,22,30,40,45,19,20,25,32,21\end{array} \]

What is a scatter plot?