A survey of a class of first$-$year psychology students asked each respondent for their gender and how many hours each spends per week on social media. The results are given in the accompanying table. Less than $5$ hrs $5$ to $<10$ hrs $10$ to $<15$ hrs $15$ to $<20$ hrs $20$ hrs or more Total Male $301043653$ Female $352153064$ Total $6531966117$ a$.$ What is the probability that this person is a male? b$.$ What is the probability that this person spends at least $20$ hours a week on social media? c$.$ What is the probability that this person is male OR spends at least $20$ hours a week on social media? d$.$ What is the probability that this person is female OR spends at least $20$ hours a week on social media? $($Type your answers in the form of a decimal rounded to two decimal place as needed.$)$ One person is randomly chosen from this class of first$-$year business students.