Compute 𝐄(𝑋) for the following random variable 𝑋:

𝑋=Number of tosses until getting 4 (including the last toss) by tossing a fair 10-sided die.

𝐄(𝑋)=

Compute the probability of rolling an odd number when tossing a fair 10-sided die.

Probability of rolling an odd number=

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