221 When 10 coins are flipped the event of interest is the n

2-2.1 When 10 coins are flipped, the event of interest is the number of heads. Let X be number
be the random variable

Find the probability density function of the random variable X and
sketch it. ·
b) Using the probability density function, find the probability that X
is in the range between four and seven inclusive.
c) Using the probabilicy density function, find the probability that X is less than four.