A BC F G 74 k 70. Point C on this Normal curve corresponds to (a) 84 grams. (b)

Question

A BC F G 74 k 70. Point C on this Normal curve corresponds to (a) 84 grams. (b) 82 grams. (c) 78 grams. (d) 76 grams. (e) 74 grams 71. About what percent of the cockroaches have weights between 76 and 84 grams? (a) 99.7% (c) 65% (b) 95% (d) 47.5% (e) 34% 72. About what percent of the cockroaches have weights less than 78 grams? (a) 34% (c) 16% (b) 32% (d) 2.5% (e) none of these 73. The proportion of observations from a standard Normal distribution with values less than 1.15 is (a) 0.1251.(c) 0.8749. (e) none of these. (b) 0.8531.(d) 0.8944 4. The proportion of observations from a standard Normal distribution with values larger than-0.75 is (a) 0.2266. (c) 0.7734. (e) none of these (b) 0.7422.(d) 0,8023

Explanation / Answer

70) 78 option C is correct

71) 76 and 84 is two standard deviation from then mean value 80.
so answer is 95% . option b is correct

72) 50-34=16 % option C is correct

73) P(Z<1.15)=0.8749 option C is correct

74) P(Z>-0.75)=0.7734 option C is correct
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