[{"id":38600,"question":"Formula to determine the size of a class is:","choices":[{"text":"X<sub>max</sub> - X<sub>min</sub>","value":"A"},{"text":"X<sub>max</sub> + X<sub>min</sub>","value":"B"},{"text":"Range/number of groups","value":"C"},{"text":"number of groups/Range","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":38340,"question":"If variance is equal to 36 then the standard deviation will be:","choices":[{"text":"36","value":"A"},{"text":"6","value":"B"},{"text":"-6","value":"C"},{"text":"none of these&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":38339,"question":"The measures that are &nbsp;used to determine the degree or extent of variation in a data set are called:","choices":[{"text":"central value&nbsp;","value":"A"},{"text":"A.M","value":"B"},{"text":"measures of dispersion&nbsp;","value":"C"},{"text":"median","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":38337,"question":"The harmonic mean of the observation 0,15,12, is:","choices":[{"text":"3.7","value":"A"},{"text":"7.3","value":"B"},{"text":"6.7","value":"C"},{"text":"no harmonic mean","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":38336,"question":"The geometric mean of the a observations 2,4,8, is:","choices":[{"text":"2","value":"A"},{"text":"8","value":"B"},{"text":"4","value":"C"},{"text":"no geometric mean","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":38335,"question":"The formula of group data of the median is:","choices":[{"text":"l + h/f (n/2 -c)","value":"A"},{"text":"l +∑fx/∑f x n,","value":"B"},{"text":"&nbsp;l + f<sub>m </sub>- f<sub>1</sub>/2f<sub>m</sub> - f<sub>1</sub> - f<sub>2</sub> x n,","value":"C"},{"text":"A + ∑fu/∑f x n","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":38332,"question":"Coding formula of group data of the arithmetic mean is:","choices":[{"text":"X̅ = ∑fX/∑f","value":"A"},{"text":"X̅ = ∑fD/∑f","value":"B"},{"text":"X̅ = A + ∑fu/∑f x h","value":"C"},{"text":"X̅ = A + &nbsp;∑fu/∑f","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":38330,"question":"The formula of grouped data of the arithmetic mean is:&nbsp;","choices":[{"text":"X̅ = ∑X/n","value":"A"},{"text":"X̅ = A + ∑fX/∑X","value":"B"},{"text":"X̅ = ∑fX/n","value":"C"},{"text":"X̅ = l +n/f (n/2 - c)","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":38328,"question":"Sum of the deviations of values x from its mean is always ''i.e ∑(x-x̅)’is to equal:&nbsp;","choices":[{"text":"itself&nbsp;","value":"A"},{"text":"zero&nbsp;","value":"B"},{"text":"median&nbsp;","value":"C"},{"text":"mode&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":38327,"question":"A histogram is g group/ set of adjacent:","choices":[{"text":"squares&nbsp;","value":"A"},{"text":"circles&nbsp;","value":"B"},{"text":"rectangle&nbsp;","value":"C"},{"text":"cube&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":38326,"question":"The total of frequency up to an upper class limit or boundary is called:","choices":[{"text":"frequency&nbsp;","value":"A"},{"text":"class frequency&nbsp;","value":"B"},{"text":"cumulative frequency&nbsp;","value":"C"},{"text":"relative frequency&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":38325,"question":"The formula of range is:","choices":[{"text":"X<sub>max</sub> -X<sub>min</sub>","value":"A"},{"text":"X<sub>max</sub> + X<sub>min</sub>","value":"B"},{"text":"groups/wight&nbsp;","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":38324,"question":"The date presented in the form of frequency distribution is called:","choices":[{"text":"distribution","value":"A"},{"text":"grouped data","value":"B"},{"text":"range data","value":"C"},{"text":"regrouped data","value":"D"},{"value":"E"}],"correctAnswer":2}]