tutor please help me. I hope you can provide a c0mplete and detailed explanation. I really need help.

Problem 4 in a company of 420 employees speak Russian, 220 employees speak English, 70 employees speak both English and Russian, How many employees speak either English or Russian? ( You may use the Venn diagram in order to solve this problem) Problem S. A closet has 4 black ties, ] red ties, and 5 white ties. Two ties are chosen without replacement. Find the probability: (a) the first tie is black and the second is white (b] the first the in black and the second is either black or white Problem'5 A card is drawn from a standard deck of cards. There are 52 cards in each of the 4 suits of spades, hearts, diamonds, and clubs, Each with contains 13 cards: ace.2,3,4,5,6,7,6,9,10,jack.queen,king: (a) calculate the probability that it is either a queen OR any card of hearts. (b] in the previous question, If a card were drawn, looked at replaced in thee deck and then a second card were drawn, calculate the probability that both cards were an Ace (of any color)Problem 1 The annual percentage returns on money Invested in shares of company Q were calculated over ten times period: period 1 3 5 7 10 * return 10 18 -2 14 17 11 20 (i) find the mean return and the standard deviation. [il) For company Z the shares have an expected return of 14% with a standard deviation of 5 %. Comment on your answer to part (i) in the light of this Information