The number of students in university during 1995-98 is given below:

Represent the information cotained in the above table by component bar chart.

The frequency distribution of the marks obtained in a school is given below. In the table, the number of students who obtained marks from 31 to 40 , is unknown . But it is known that the average of total work obtained by the students is 42.85. Find the lost frequency.

Donations (in rupees) are given for a fare by the 100 students of a school. In the following table rate of donation and the number of students are given. In the above data, the rate of donation of 24 students is unknown , but it is known to us that the average rate of donation is Rs. 1.27 . Find teh unknown frequency.

The average of weights (in kg) and the number of students of a school of given below. Find their collective average.

A class contains three girls and four boys. Every Saturday, five go on a picnic (a different group of students is sent every week). During the picnic, each girl in the group is given a doll by the accompanying teacher. If all possible groups of five have gone for picnic once, the total number of dolls that the girls have got is a. 21 b. 45 c. 27 d. 24

Given below is a pedigree chart chowing the inheritance of a certain sex-linked trait in humans: the trait traced in the above pedigree chart is:

The marks obtained in mathematics by 30 students of Class X of a certain scholl are given in table the below. Find the mean of the marks obtained by the students.

Given below is a pedigree chart of a family with five children. It shows the inheritance of attached ear lobes as opposed to the free ones. The squares represent the male indiones. The squares represent the male individuals and circles the female individuals Which of one of the following conclusions drawn is correct?

Haemophilia is a sex linked recessive disorder of humans. The pedigree chart given below shows the inheritance of Haemophilia in one family. Study the pattern of inheritance and answer the questions given. (a) Give all the possible genotypes of the members 4, 5 and 6 in the pedigree chart. (b) A blood test shows that the individual 14 is a carrier of haemophilia. The member numbered 15 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male ? Show with the help of Punnett square.

Consider the statements given below regarding contraception and answer is directed thereafter (a) medical termination of pregnancy (MTP) during first trimester is generally safe (b). Genearlly chances of conception are nil until mother breast feeds the infant upto two years (c). Intrauterine devices like copper-T are effective contraceptives (d). Contraception pills may be taken upto one week after coitus to prevent conceptions Which two of the above statements are correct?