please help me to solve this

QUESTION 6 It is known that a particular machine produces 90% nondefective electrical components. A box of 10!] items of these electrical components will be rejected by a buyer if not less than 15% of the items are defective. a) 'What is the probability that a buyer will reject a box of these electrical components? [3 marks} b) A buyer ordered S boxes of these electical components. How many of these boxes will be rejected by the buyer? [2 marks}