Aunt Sally lives in the UK and frequently audio calls her relatives in Pakistan. Let’s suppose that 55% of her audio calls were preceded by a voice note, and over the span of the past year, she has...

Aunt Sally lives in the UK and frequently audio calls her relatives in Pakistan. Let’s
suppose that 55% of her audio calls were preceded by a voice note, and over the span
of the past year, she has made around 10 calls home. What is the probability that:
a) At most 6 of the voice calls made were preceded by a voice note? (2)
b) Exactly 6 voice calls were preceded by a voice note? (2)
c) At least 6 of her voice calls were preceded by voice notes? (2)