please someone solve these questions for me asap

Question 1: (Marks 6) a. 27% students have passed their last year's degree examination. A random sample of 7 students is selected. Find the probability that 4 to 6 students passed the examination. (3) b. There are 5 red and 7 white balls in a hex. If 5 balls are drawn randomly from the box. Find the probability that 3 are not red. (3) Question 2: (Marks 6) a. A manufacturing company's switch board receive an average of 3 incoming calls per minute. Find the probability of 4 incoming calls in 2 minutes. (3) b. A certain type of storage battery lasts on average 5 years with a standard deviation of 0.7 years assuming that the battery lives are normally distributed, nd the probability that a given battery will last. i. Between 2.4 years and 3.6 years (1) ii. Less than 2.3 years (1) iii. Life of battery is highest 18% lives (1) Question 3: (Marks 4) Fit a straight line trend to the following data by the method of least square. -Elm@ m-nm Find the expected values in years 1996 and 1998. Question 4: (Marks 4) Construct Chain Indices for the following years taking 1980 as base \