The probability that an event will fail to happen is $0.05$. The probability that the event will take place on $4$ consecutive occasions is

$A$ manufacturer of locks knows that $2 \%$ of his product is defective. If he sells the locks in boxes each with $100$ locks and guarantees that not more than $2$ locks will be defective in a box,then the probability that a box will fail to meet the guaranteed quality is

In a binomial distribution,the probability of success is $\frac{1}{4}$ and the standard deviation is $3$. Then,its mean is

$A$ fair coin is tossed $100$ times. The probability of getting a head an even number of times is

$A$ multiple choice test consists of $5$ questions,each question having $4$ responses. There is only one correct response and the remaining $3$ are incorrect responses. If a candidate attempts all the $5$ questions,then the probability that he answers at least $3$ questions incorrectly is

Four fair dice are thrown independently $27$ times. Then the expected number of times,at least two dice show up a three or a five,is