Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

Workout the probability in fraction form that the card chosen is:

an odd number.

Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

Workout the probability that the card chosen is: Prime number.

Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

Workout the probability in decimal form that the card chosen is:

A factor of $100$.

Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

Workout the probability in fraction form that the card chosen is: $5$

Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

Workout the probability in fraction form that the card chosen is: $5$ or less.

Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

Workout the probability in fraction form that the card chosen is: $5$ or more.

Here are eight number cards.

$2, 3, 5, 7, 11, 13, 17, 19$

The cards are placed face down. A card is chosen without looking.

The probability of getting  $5, 5$ or less and $5$ or more 

Zara says:

One of the outcomes in the above must happen and so the probabilities must add up to $1$.

Explain why Zara is incorrect.

A computer produces a two-digit random number from $00$ to $99$. The outcome of every pair of digits is equally likely.

Work out the probability in decimal form that: 

Both the digits are $6$.

A computer produces a two-digit random number from $00$ to $99$. The outcome of every pair of digits is equally likely.

Work out the probability in decimal form that: 

Exactly one digit is $6$.