Heights (in cm) of 25 children are given below:
168, 165, 163, 160, 163, 161, 162, 164, 163, 162, 164, 163, 160, 163, 160, 165, 163, 162, 163, 164, 163, 160, 165, 163, 162
What is the mode of their heights? What do we understand by mode here?

The heights of 30 students of class IX are given below: 158,155,154,158,160,148,150,153,159,161,148,157,162,159,151,154,156,152,156 ,160,152,147,155,163,155,153,157. prepare a frequency distributions table with 150-154 as one of the class intervals.

The heights (in cm) of 30 students of class VIII are given below: 150,152,154,152,148,149,150,155,159,160,152,154,160,149,150,152,155,145,154,145,148,153,155,150,160,154,152,149,152,148. Prepare a frequency table with 160-164 as one of the class intervals

A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?

A doctor is called to see a sick child. The doctor knows (prior to the visit) that 90% of the sick children in that neighbourhood are sick with the flu, denoted by F , while 10% are sick with the measles, denoted by Mdot A well-known symptom of measles is a rash, denoted by R. The probability having a rash for a child sick with the measles is 0.95. however, occasionally children with the flu also develop a rash, with conditional probability 0.08. upon examination the child, the doctor finds a rash. The what is the probability that the child has the measles? a. 91//165 b. 90//163 c. 82//161 d. 95//167