Thirty women were examined in a hospital by a doctor and the number of heat beats per minute were recorded and summarised as follows:
Find number of women have heart bean lessthan 80 and more than 71

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarised as follows.Find the mean heart beats per minute for these women,choosing a suitable method.

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute recorded and summarised as follows. Find the mean heart beats per minute for these women, choosing a suitable method. No. of heat 65-68 68-71 71-74 74-77 77-80 80-83 83-86 beats (per min.) No. of women: 2 4 3 8 7 4 2

In a examination , the number of those who passed and the number of those who faild were in the ratio 25:4 .If five more had appeared and the number of failures were 2 less than earlier , the ratio of students who failed would have been 22:3 . Find the total number who appeared at the examination .

In an examination, the number of those who passed and the number of those who failed were in the ratio 25:4. If five more had appeared and the number of failures were 2 less than earlier, the ratio of those passed to failures would be 22:3. The number who appeared at the examination is

₹ 250 were divided equally among a certain number of children. If there were 25 more children, each would have received 50 paise less. Find the number of children.

Fifty seeds were selected at random from each 5 bags of seeds and were kept under standardised conditions favourable to germination . After 20 days , the number of seeds which had germinated in each collection were counted and recorded as follows : What is the probability of germination of (i) more than 40 seeds from a bag ? (ii) 49 seeds from a bag ? (iii) more than 35 seeds from a bag ?

Consider the following elements B C F Cl N O If x,y and z are the number of elements having more electron affinity (Ea_(1)) than nitrogen, the number of elements having ionisation energy more than that of Na and the number of elements having electronegativity more than (or) almost equal to N respectively, find x+y+z . Fill your answer as sum of digit (excluding decimal places) till you get the single digit answer.

In Rutherford's alpha particle cexperiment with thin gold faill, 8100 scattered alpha -particles per unit ara per unit area per minute were observed at an anle of 60^(@) . Find the number of scattered alpha particles pr unit area per minut e at and angle of 120^(@)

100 plants each were sown in six different colonies A, B, C, 0, E and F. After 31 days, the number of plants survived are as follows: Find the probability that: less than 82 plants survived in a colony?