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IGNOU MCH-14 (July 2025 – June 2026) Assignment Questions
9. (a) Two coins are tossed simultaneously then find probability of getting at least one head.
(b) A number is chosen at random from the first 40 natural numbers. Calculate the probability that the selected is divisible by 5 or 7.
(c) A bag contains 8 red balls and 5 black balls. Two balls are drawn one by one without replacement. Find the probability that both balls are red.
(d) Define Binomial, Poisson and Normal distribution with appropriate equation and name their terms.
10. (a) Define Error and their types in quantitative chemical analysis.
(b) In an iron determination from the same amount of sample, the five replicate results were obtained: 20.1, 19.6, 20.0 and 19.9 and 20.4 mg iron. Calculate the standard deviation, variance, standard deviation of mean, coefficient of variation and relative standard deviation in ppm of the given data.
IGNOU MCH-14 (January 2025 – December 2025) Assignment Questions
1. State whether the following statement are TRUE or FALSE. Give reason in support of your answer.
2. Solve the following system of equations using Cramer’s rule.
c) In an iron determination (taking 1 g sample every time) the following four replicate results were obtained: 24.8, 25.2, 23.6 and 24.7 mg iron. Calculate the coefficient of variation and relative standard deviation in ppm of the given data.
6. a) In a factory there are three machines A, B, C which produce 10%, 40% and 50% items respectively. Past experience shows that percentage of defective items produced by machines A, B, C are 5%, 4%, 2% respectively. An item from the production of these machines is selected at random and it is found defective. What is the probability that it is produced by machine A?
b) Assume that in a population each person is equally likely to have a particular disease and disease status of each individual is independent of each other, then find the probability that out of the 5 randomly selected individuals who are tested for this particular disease exactly 3 have this disease.
c) A hospital specialising in heart surgery. In 2023 total of 1000 patients were admitted for treatment. The average payment made by a patient was Rs 1,00,000 with a standard deviation of Rs 20000. Under the assumption that payments follow a normal distribution, find the number of patients who paid between Rs 90,000 and Rs 1,10,000.
