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3. The scores and pass/fail status from a random sample of 10 examination papers are shown below. (4 marks) Paper Grade Status Number 65 Pass 87 Pass 92 Pass 35 Fail 79 Pass 100 Pass 48 Fail 8 74 Pass Pass 10 79 91 Pass a. The point estimate for the mean of the population is 750 1i 100 ii. 85 iv. 75 b. The point estimate for the standard deviation of the population is 1. 419.43 li. 20.48 ili. 75 iv. 750 c. The point estimate for the variance of the population is 1. 419.43 i. 20.48 ili. 75 iv. 750 d. The point estimate for the proportion of all students who passed the course is i. 0.8 Acti ii. 0.2 iii. 1.8 Go to iv. 1.2