Advertisements
Advertisements
प्रश्न
The mortality rate for a certain disease is 7 in 1000. What is the probability for just 2 deaths on account of this disease in a group of 400? [Given e–2.8 = 0.06]
Advertisements
उत्तर
Since the mortality rate for a certain disease in 7 in loop
∴ p = `7/1000` and n = 400
The value of mean A = λp
= `400 xx 7/1000`
∴ λ = 2.8
Let x be a random variable following distribution with p(x) = `("e"^(-lambda)lambda^x)/(x!)`
∴ The distribution is P(X = 2) = `("e"^(-2 - 8) (2.8)^2)/(2!)`
= `(0.06 xx 7.84)/2`
= 0.2352
APPEARS IN
संबंधित प्रश्न
Define Binomial distribution
If 5% of the items produced turn out to be defective, then find out the probability that out of 20 items selected at random there are atleast two defectives
In a particular university 40% of the students are having newspaper reading habit. Nine university students are selected to find their views on reading habit. Find the probability that all those selected have newspaper reading habit
Out of 750 families with 4 children each, how many families would be expected to have children of both sexes? Assume equal probabilities for boys and girls.
A pair of dice is thrown 4 times. If getting a doublet is considered a success, find the probability of 2 successes
A car hiring firm has two cars. The demand for cars on each day is distributed as a Posison variate, with mean 1.5. Calculate the proportion of days on which some demand is refused
The distribution of the number of road accidents per day in a city is poisson with mean 4. Find the number of days out of 100 days when there will be no accident
Choose the correct alternative:
In a binomial distribution, the probability of success is twice as that of failure. Then out of 4 trials, the probability of no success is
The birth weight of babies is Normally distributed with mean 3,500g and standard deviation 500g. What is the probability that a baby is born that weighs less than 3,100g?
People’s monthly electric bills in Chennai are normally distributed with a mean of ₹ 225 and a standard deviation of ₹ 55. Those people spend a lot of time online. In a group of 500 customers, how many would we expect to have a bill that is ₹ 100 or less?
