**Ten coins are tossed simultaneously. Find the probability of getting at least 7 heads.**

**2. A die is tossed twice. Getting a number greater than 4 is considered a success. Find the mean and variance of the probability of number of success.**

Solution,

**3. Find the probability that in five tosses of a fair die, 3 will appear (i) twice, (ii) at most once, and (iii) at least two times.**

Solution,

**4. A coin is tossed for 7 times and the experiment is repeated for 128 times. Find the probability distribution. [Important]**

Solution,

n=7; p = 1/2; q = 1/2

**5. The incidence of occupational disease in an industry is such that workers have a 20% chance of suffering from it. What is the probability that out of six workers chosen at random, four or more will suffer the disease?**

Solution,

**6. The probability of a man hitting a target is 0.25. How many times must he fire so that the probability of hitting the target at least once is greater than 2/3?**

Solution,

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