When it is more conveninet to use grouped date for analysis ?

pi is more when

Why is top soil more useful to us ?

In the following how many cations are belongs to V group in qualitative salt analysis Ba^(+2), Mg^(+2), Pb^(+2), Cu^(+2), Sr^(+2), Sn^(+2) Ca^(+2)

H_(2)S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group because :

Why is soil more useful for us?

For a group of 500 members is a food provision for 24 days. If 300 more Joined in the group for how many days the food will be sufficient?

Which one of the folloiwng symbols and its representation used in human pedigree analysis is correct?

How many of the following cations belongs to group IIA in qualitative salt analysis Sn^(2+), Hg_(2)^(+2), Pb^(+2), Zn^(2+), Cu^(+2), Cr^(+3), As^(+3), Mg^(+2), Sb^(+3)

Write the formula for the median of a grouped data. Explain symbol with their used meaning.