10. Correct. The answer is false

a) 95% `x + s/√n = `x + 1.96ŝ/√n = 8.24 + 1.96(0.42//√200)

= 8.24+ 0.058g.

b) 99% `x + s/√n = `x + 2.58ŝ/√n = 8.24 + 2.58(0.42//√200)

= 8.24+ 0.077g.