1. 1) There is a normal distribution with mean = 10 and standard deviation = 1. What is the
probability that a randomly drawn item is less than 8.5 or greater than 9.5?
0.6247
0.2417
0.7583
0.3413
2) The probability of a star on an old device a slide-rule is 0.4. Out of 6 slide-rules, what is the
probability less than 3 have stars?
0.4557
0.8208
0.2765
0.5443
3) In a normal distribution, if the mean = 100 and the standard deviation = 6,
then 50% of the items, symmetrically distributed around the mean, lie between 93.86 to 106.14
then the variance is 2.449
then 10% of the items are above 116.06
then 60% of the items are at least 98.5A.
0.6247 B.
0.2417 C.
0.7583 D.
0.3413