B: Choose correct:

$1-$ Cumulative frequency table helpful in:

Mean

b$)$Median

c$)$Mode

d$)$ None of these

$2-$ If $r=-0\mathrm{.}41$ that's mean :

a$)$ Weak correlation negative

b$)$ strong correlation positive

c$)$ no correlation

$3-$ Which of the following is not a measure of dispersion?

a$)$ Range

b$)$ Standard deviation

c$)$ Arithmetic mean

d$)$ Variance

$4-.$ The sum of all deviations of the data from its mean

a$)$ Always positive

$($b$)$ always negative

$($c$)$ zero

$($d$)$ non$-$zero integer

$5-$If $($ a $)$ it represents the upper bound and $($ b $)$ represents the lower bound, then the midpoint $=\frac{a-b}{2}$

b$)\frac{a-b}{4}$

c$)\frac{a+b}{2}$

d$)\frac{a+b}{4}$