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Statistics — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsStatistics4 Marks
Question
Read the Source Text given below and answer these questions:
A teacher is a person whose professional activity involves planning, organizing, and conducting group activities to develop students’ knowledge, skills, and attitudes as stipulated by educational programs. Teachers may work with students as a whole class, in small groups or one$-$to$-$one, inside or outside regular classrooms. In this indicator, teachers are compared by their average age and work experience measured in years.
For the same in $2015,$ the following distribution of ages $($in years$)$ of primary school teachers in a district was collected to evaluate the teacher on the above$-$mentioned criterion.

$i.$ Write the lower limit of the first$-$class interval:
$a. 15$
$b. 20$
$c. 17.5$
$d. 5$
$ii.$ Determine the class limits of the fourth class interval:
$a. 25-30$
$b. 30-35$
$c. 40-45$
$d. 45-50$
$iii.$ Find the class mark of class $45-50:$
$a. 45.5$
$b. 47.5$
$c. 54.5$
$d. 55.5$
$iv.$ Determine the class size:
$a. 4$
$b. 5.5$
$c. 5$
$d. 6$
$v. $Facts or figures collected with a definite purpose are called $..........$
$a.$ Data.
$b.$ Sample.
$c.$ Information.
$d.$ Statistics.
✓

Answer

$(i)$ $(a)$ $15$
$(ii)$ $(b)$ $30-35$
$(iii)$ $(b)$ $47.5$
$(iv)$ $(c)$ $5$
$(v)$ $(a)$ Data.

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