It has been found from an experiment that 40% of rats stimulated on administering a particular drug. If 5 rats are given drug. Find probability that exactly three rats stimulated.
KUMAR PRAKASHAN|Exercise Practice Paper - 3 (Section - D)|1 Videos
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In a railway reservation office two clerks are engaged in checking reservation form. On an average first clerk check 55% of the forms while second clerk check remaining. The first clerk has an error rate of 0.33 and second has an error rate 0.02. The reservation form is selected at random from the total number of forms checked during day, and is found to have an error. Find the probability of an event that it was checked by second clerk.
Assume that the chances of a patient having a heart attack is 40%. It is also assumed that a meditation and yoga course reduce the risk of heart attack by 30% and prescription of certain drug reduces its chances by 25%. At a time a patient can choose any one of the two options with equal probabilities. It is given that after going through one of the two options the patient selected at random suffers a heart attack. Find the probability that the patient followed a course of meditation and yoga?
A die is thrown three times. Events A and B are defined as below: A : 4 on the third throw B : 6 on the first and 5 on the second throw Find the probability of A given that B has already occurred.
An insurance company selected 2000 drivers at random (i.e., without any preference of one driver over another) in a particular city to find a relationship between age and accidents . The data obtained are given in following table : Find the probabilities of the following events for a driver chosen at random from the city. being 18-29 years of age and having exactly 3 accidents in one year.
An insurance company selected 2000 drivers at random (i.e., without any preference of one driver over another) in a particular city to find a relationship between age and accidents. The data obtained is given in the following table: Find the probabilities of the following events for a driver chosen at random from the city: (i) The driver being in the age group 18-29 years and having exactly 3 accidents in one year. (ii) The driver being in the age group of 30-50 years and having one or more accidents in a year. (iii) Having no accidents in the year.
In a factory which manufactures bolts, machines A, B and C manufacture respectively 25%, 35% and 40% of the bolts. Of their outputs, 5, 4 and 2 percent are respectively defective bolts. A bolt is drawn at random from the product and is found to be defective. What is the probability that it is manufactured by the machine B ?
The three urns having the numbers of white and black balls are given below : The probability of chosing every urn is equl. A ball is chosen randomly from the urn is found to be white. Then find the probability that the ball chosen was that form urn-2.
KUMAR PRAKASHAN-PROBABILITY-Practice Paper - 13 (Section - D (Answer the following questions))
