In the old days, there was a probability of 0.8 of success in any attempt to make a telephone call.Calculate the probability of having 7 successes in 10 attempts.?

A) 0.4313
B) 0.4125
C) 0.2013
D) 0.2865

The random variable X has binomial distribution B(6,0.4). Determine each of the following. a) P(X≥4)
b) P(X<2).?

A) P(X≥4) = 0.0973 ,P(X<2) = 1.22
B) P(X≥4) = 0.1273 ,P(X<2) = 1.54
C) P(X≥4) = 0.0523 ,P(X<2) = 0.98
D) P(X≥4) = 0.09255 ,P(X<2) = 1.82

The probability of a customer ordering the colour of a particular model of new car in silver is 0.2. Find the probability that in next 10 random orders there will be at most 8 orders in silver.?

A) 0.025
B) 0.002
C) 0.58
D) 0.99

The probability that Phil will walk to work is 0.1. The last 20 days that Phil went to work are examined. Determine the mean and variance of the number of days that Phil walked to work in the last 20 working days.?

A) \$\mu\$ = 5 ,\$\sigma^2\$ = 1.3
B) \$\mu\$ = 2 ,\$\sigma^2\$ = 1.8
C) \$\mu\$ = 4 ,\$\sigma^2\$ = 2.2
D) \$\mu\$ = 6 ,\$\sigma^2\$ = 2.3

The probability of a random customer ordering a vegetarian meal in the Ampala restaurant is 0.2. Find the mean and variance of the vegetarian meals in a total of 40 orders.?

A) \$\mu\$ = 8 ,\$\sigma^2\$ = 6.4
B) \$\mu\$ = 7 ,\$\sigma^2\$ = 4.9
C) \$\mu\$ = 4 ,\$\sigma^2\$ = 1.6
D) \$\mu\$ = 6 ,\$\sigma^2\$ = 3.6